diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 76b371e6..09d10aa7 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -80,6 +80,15 @@ target_link_libraries(test_fragment_store PUBLIC
 
 ########################################
 
+add_executable(convert_frag_to_obj
+	fragment_store/convert_frag_to_obj.cpp
+)
+
+target_link_libraries(convert_frag_to_obj PUBLIC
+	fragment_store
+)
+
+########################################
 add_executable(tomato
 	./main.cpp
 	./icon.rc
diff --git a/src/fragment_store/backends/filesystem_storage.cpp b/src/fragment_store/backends/filesystem_storage.cpp
index 895cad98..8b8685bb 100644
--- a/src/fragment_store/backends/filesystem_storage.cpp
+++ b/src/fragment_store/backends/filesystem_storage.cpp
@@ -2,6 +2,9 @@
 
 #include "../meta_components.hpp"
 
+#include <solanaceae/util/utils.hpp>
+
+#include <entt/container/dense_set.hpp>
 #include <nlohmann/json.hpp>
 
 #include <solanaceae/file/file2_std.hpp>
@@ -22,9 +25,65 @@ static const char* metaFileTypeSuffix(MetaFileType mft) {
 	return ""; // .unk?
 }
 
+// TODO: move to ... somewhere. (span? file2i?)
+static ByteSpan spanFromRead(const std::variant<ByteSpan, std::vector<uint8_t>>& data_var) {
+	if (std::holds_alternative<std::vector<uint8_t>>(data_var)) {
+		auto& vec = std::get<std::vector<uint8_t>>(data_var);
+		return {vec.data(), vec.size()};
+	} else if (std::holds_alternative<ByteSpan>(data_var)) {
+		return std::get<ByteSpan>(data_var);
+	} else {
+		assert(false);
+		return {};
+	}
+}
+
+// TODO: move somewhere else
+static bool serl_json_data_enc_type(const ObjectHandle oh, nlohmann::json& out) {
+	out = static_cast<std::underlying_type_t<Encryption>>(
+		oh.get<ObjComp::DataEncryptionType>().enc
+	);
+	return true;
+}
+
+static bool deserl_json_data_enc_type(ObjectHandle oh, const nlohmann::json& in) {
+	oh.emplace_or_replace<ObjComp::DataEncryptionType>(
+		static_cast<Encryption>(
+			static_cast<std::underlying_type_t<Encryption>>(in)
+		)
+	);
+	return true;
+}
+
+static bool serl_json_data_comp_type(const ObjectHandle oh, nlohmann::json& out) {
+	out = static_cast<std::underlying_type_t<Compression>>(
+		oh.get<ObjComp::DataCompressionType>().comp
+	);
+	return true;
+}
+
+static bool deserl_json_data_comp_type(ObjectHandle oh, const nlohmann::json& in) {
+	oh.emplace_or_replace<ObjComp::DataCompressionType>(
+		static_cast<Compression>(
+			static_cast<std::underlying_type_t<Compression>>(in)
+		)
+	);
+	return true;
+}
+
 namespace backend {
 
-FilesystemStorage::FilesystemStorage(ObjectStore2& os) : StorageBackendI::StorageBackendI(os) {
+FilesystemStorage::FilesystemStorage(ObjectStore2& os, std::string_view storage_path) : StorageBackendI::StorageBackendI(os), _storage_path(storage_path) {
+	_sc.registerSerializerJson<ObjComp::DataEncryptionType>(serl_json_data_enc_type);
+	_sc.registerDeSerializerJson<ObjComp::DataEncryptionType>(deserl_json_data_enc_type);
+	_sc.registerSerializerJson<ObjComp::DataCompressionType>(serl_json_data_comp_type);
+	_sc.registerDeSerializerJson<ObjComp::DataCompressionType>(deserl_json_data_comp_type);
+
+	// old stuff
+	_sc.registerSerializerJson<FragComp::DataEncryptionType>(serl_json_data_enc_type);
+	_sc.registerDeSerializerJson<FragComp::DataEncryptionType>(deserl_json_data_enc_type);
+	_sc.registerSerializerJson<FragComp::DataCompressionType>(serl_json_data_comp_type);
+	_sc.registerDeSerializerJson<FragComp::DataCompressionType>(deserl_json_data_comp_type);
 }
 
 FilesystemStorage::~FilesystemStorage(void) {
@@ -39,38 +98,38 @@ bool FilesystemStorage::write(Object o, std::function<write_to_storage_fetch_dat
 
 	ObjectHandle oh {reg, o};
 
-	if (!oh.all_of<FragComp::Ephemeral::FilePath>()) {
+	if (!oh.all_of<ObjComp::Ephemeral::FilePath>()) {
 		// not a file fragment?
 		return false;
 	}
 
-	// split object storage
+	// split object storage (meta and data are 2 files)
 
-	MetaFileType meta_type = MetaFileType::TEXT_JSON; // TODO: better defaults
-	if (reg.all_of<FragComp::Ephemeral::MetaFileType>(o)) {
-		meta_type = oh.get<FragComp::Ephemeral::MetaFileType>().type;
+	MetaFileType meta_type = MetaFileType::TEXT_JSON; // TODO: better defaults?
+	if (reg.all_of<ObjComp::Ephemeral::MetaFileType>(o)) {
+		meta_type = oh.get<ObjComp::Ephemeral::MetaFileType>().type;
 	}
 
-	Encryption meta_enc = Encryption::NONE; // TODO: better defaults
-	Compression meta_comp = Compression::NONE; // TODO: better defaults
+	Encryption meta_enc = Encryption::NONE; // TODO: better defaults?
+	Compression meta_comp = Compression::NONE; // TODO: better defaults?
 
 	if (meta_type != MetaFileType::TEXT_JSON) {
-		if (oh.all_of<FragComp::Ephemeral::MetaEncryptionType>()) {
-			meta_enc = oh.get<FragComp::Ephemeral::MetaEncryptionType>().enc;
+		if (oh.all_of<ObjComp::Ephemeral::MetaEncryptionType>()) {
+			meta_enc = oh.get<ObjComp::Ephemeral::MetaEncryptionType>().enc;
 		}
 
-		if (oh.all_of<FragComp::Ephemeral::MetaCompressionType>()) {
-			meta_comp = oh.get<FragComp::Ephemeral::MetaCompressionType>().comp;
+		if (oh.all_of<ObjComp::Ephemeral::MetaCompressionType>()) {
+			meta_comp = oh.get<ObjComp::Ephemeral::MetaCompressionType>().comp;
 		}
 	} else {
 		// we cant have encryption or compression
 		// so we force NONE for TEXT JSON
 
-		oh.emplace_or_replace<FragComp::Ephemeral::MetaEncryptionType>(Encryption::NONE);
-		oh.emplace_or_replace<FragComp::Ephemeral::MetaCompressionType>(Compression::NONE);
+		oh.emplace_or_replace<ObjComp::Ephemeral::MetaEncryptionType>(Encryption::NONE);
+		oh.emplace_or_replace<ObjComp::Ephemeral::MetaCompressionType>(Compression::NONE);
 	}
 
-	std::filesystem::path meta_tmp_path = oh.get<FragComp::Ephemeral::FilePath>().path + ".meta" + metaFileTypeSuffix(meta_type) + ".tmp";
+	std::filesystem::path meta_tmp_path = oh.get<ObjComp::Ephemeral::FilePath>().path + ".meta" + metaFileTypeSuffix(meta_type) + ".tmp";
 	meta_tmp_path.replace_filename("." + meta_tmp_path.filename().generic_u8string());
 	// TODO: make meta comp work with mem compressor
 	//auto meta_file_stack = buildFileStackWrite(std::string_view{meta_tmp_path.generic_u8string()}, meta_enc, meta_comp);
@@ -85,14 +144,14 @@ bool FilesystemStorage::write(Object o, std::function<write_to_storage_fetch_dat
 
 	Encryption data_enc = Encryption::NONE; // TODO: better defaults
 	Compression data_comp = Compression::NONE; // TODO: better defaults
-	if (oh.all_of<FragComp::DataEncryptionType>()) {
-		data_enc = oh.get<FragComp::DataEncryptionType>().enc;
+	if (oh.all_of<ObjComp::DataEncryptionType>()) {
+		data_enc = oh.get<ObjComp::DataEncryptionType>().enc;
 	}
-	if (oh.all_of<FragComp::DataCompressionType>()) {
-		data_comp = oh.get<FragComp::DataCompressionType>().comp;
+	if (oh.all_of<ObjComp::DataCompressionType>()) {
+		data_comp = oh.get<ObjComp::DataCompressionType>().comp;
 	}
 
-	std::filesystem::path data_tmp_path = oh.get<FragComp::Ephemeral::FilePath>().path + ".tmp";
+	std::filesystem::path data_tmp_path = oh.get<ObjComp::Ephemeral::FilePath>().path + ".tmp";
 	data_tmp_path.replace_filename("." + data_tmp_path.filename().generic_u8string());
 	auto data_file_stack = buildFileStackWrite(std::string_view{data_tmp_path.generic_u8string()}, data_enc, data_comp);
 	if (data_file_stack.empty()) {
@@ -107,6 +166,7 @@ bool FilesystemStorage::write(Object o, std::function<write_to_storage_fetch_dat
 		nlohmann::json meta_data_j = nlohmann::json::object(); // metadata needs to be an object, null not allowed
 		// metadata file
 
+		// TODO: refactor extract to OS
 		for (const auto& [type_id, storage] : reg.storage()) {
 			if (!storage.contains(o)) {
 				continue;
@@ -115,8 +175,8 @@ bool FilesystemStorage::write(Object o, std::function<write_to_storage_fetch_dat
 			//std::cout << "storage type: type_id:" << type_id << " name:" << storage.type().name() << "\n";
 
 			// use type_id to find serializer
-			auto s_cb_it = _os._sc._serl_json.find(type_id);
-			if (s_cb_it == _os._sc._serl_json.end()) {
+			auto s_cb_it = _sc._serl_json.find(type_id);
+			if (s_cb_it == _sc._serl_json.end()) {
 				// could not find serializer, not saving
 				continue;
 			}
@@ -140,7 +200,7 @@ bool FilesystemStorage::write(Object o, std::function<write_to_storage_fetch_dat
 					std::filesystem::remove(meta_tmp_path);
 					while (!data_file_stack.empty()) { data_file_stack.pop(); }
 					std::filesystem::remove(data_tmp_path);
-					std::cerr << "FS error: binary writer creation failed '" << oh.get<FragComp::Ephemeral::FilePath>().path << "'\n";
+					std::cerr << "FS error: binary writer creation failed '" << oh.get<ObjComp::Ephemeral::FilePath>().path << "'\n";
 					return false;
 				}
 
@@ -152,7 +212,7 @@ bool FilesystemStorage::write(Object o, std::function<write_to_storage_fetch_dat
 						std::filesystem::remove(meta_tmp_path);
 						while (!data_file_stack.empty()) { data_file_stack.pop(); }
 						std::filesystem::remove(data_tmp_path);
-						std::cerr << "FS error: binary writer failed '" << oh.get<FragComp::Ephemeral::FilePath>().path << "'\n";
+						std::cerr << "FS error: binary writer failed '" << oh.get<ObjComp::Ephemeral::FilePath>().path << "'\n";
 						return false;
 					}
 				}
@@ -203,27 +263,24 @@ bool FilesystemStorage::write(Object o, std::function<write_to_storage_fetch_dat
 		data_file_stack.top()->write({buffer.data(), buffer_actual_size});
 	} while (buffer_actual_size == buffer.size());
 
-	//meta_file.flush();
-	//meta_file.close();
+	// flush // TODO: use scope
 	while (!meta_file_stack.empty()) { meta_file_stack.pop(); } // destroy stack // TODO: maybe work with scope?
-	//data_file.flush();
-	//data_file.close();
 	while (!data_file_stack.empty()) { data_file_stack.pop(); } // destroy stack // TODO: maybe work with scope?
 
 	std::filesystem::rename(
 		meta_tmp_path,
-		oh.get<FragComp::Ephemeral::FilePath>().path + ".meta" + metaFileTypeSuffix(meta_type)
+		oh.get<ObjComp::Ephemeral::FilePath>().path + ".meta" + metaFileTypeSuffix(meta_type)
 	);
 
 	std::filesystem::rename(
 		data_tmp_path,
-		oh.get<FragComp::Ephemeral::FilePath>().path
+		oh.get<ObjComp::Ephemeral::FilePath>().path
 	);
 
 	// TODO: check return value of renames
 
-	if (oh.all_of<FragComp::Ephemeral::DirtyTag>()) {
-		oh.remove<FragComp::Ephemeral::DirtyTag>();
+	if (oh.all_of<ObjComp::Ephemeral::DirtyTag>()) {
+		oh.remove<ObjComp::Ephemeral::DirtyTag>();
 	}
 
 	return true;
@@ -233,5 +290,261 @@ bool FilesystemStorage::read(Object o, std::function<read_from_storage_put_data_
 	return false;
 }
 
+void FilesystemStorage::scanAsync(void) {
+	scanPathAsync(_storage_path);
+}
+
+size_t FilesystemStorage::scanPath(std::string_view path) {
+	// TODO: extract so async can work (or/and make iteratable generator)
+
+	if (path.empty() || !std::filesystem::is_directory(path)) {
+		std::cerr << "FS error: scan path not a directory '" << path << "'\n";
+		return 0;
+	}
+
+	// step 1: make snapshot of files, validate metafiles and save id/path+meta.ext
+	// can be extra thread (if non vfs)
+	struct ObjFileEntry {
+		std::string id_str;
+		std::filesystem::path obj_path;
+		std::string meta_ext;
+
+		bool operator==(const ObjFileEntry& other) const {
+			// only compare by id
+			return id_str == other.id_str;
+		}
+	};
+	struct ObjFileEntryHash {
+		size_t operator()(const ObjFileEntry& it) const {
+			return entt::hashed_string(it.id_str.data(), it.id_str.size());
+		}
+	};
+	entt::dense_set<ObjFileEntry, ObjFileEntryHash> file_obj_list;
+
+	std::filesystem::path storage_path{path};
+
+	auto handle_file = [&](const std::filesystem::path& file_path) {
+		if (!std::filesystem::is_regular_file(file_path)) {
+			return;
+		}
+		// handle file
+
+		if (file_path.has_extension()) {
+			// skip over metadata, assuming only metafiles have extentions (might be wrong?)
+			// also skips temps
+			return;
+		}
+
+		auto relative_path = std::filesystem::proximate(file_path, storage_path);
+		std::string id_str = relative_path.generic_u8string();
+		// delete all '/'
+		id_str.erase(std::remove(id_str.begin(), id_str.end(), '/'), id_str.end());
+		if (id_str.size() % 2 != 0) {
+			std::cerr << "FS error: non hex object uid detected: '" << id_str << "'\n";
+		}
+
+		if (file_obj_list.contains(ObjFileEntry{id_str, {}, ""})) {
+			std::cerr << "FS error: object duplicate detected: '" << id_str << "'\n";
+			return; // skip
+		}
+
+		const char* meta_ext = ".meta.msgpack";
+		{ // find meta
+			// TODO: this as to know all possible extentions
+			bool has_meta_msgpack = std::filesystem::is_regular_file(file_path.generic_u8string() + ".meta.msgpack");
+			bool has_meta_json = std::filesystem::is_regular_file(file_path.generic_u8string() + ".meta.json");
+			const size_t meta_sum =
+				(has_meta_msgpack?1:0) +
+				(has_meta_json?1:0)
+			;
+
+			if (meta_sum > 1) { // has multiple
+				std::cerr << "FS error: object with multiple meta files detected: " << id_str << "\n";
+				return; // skip
+			}
+
+			if (meta_sum == 0) {
+				std::cerr << "FS error: object missing meta file detected: " << id_str << "\n";
+				return; // skip
+			}
+
+			if (has_meta_json) {
+				meta_ext = ".meta.json";
+			}
+		}
+
+		file_obj_list.emplace(ObjFileEntry{
+			std::move(id_str),
+			file_path,
+			meta_ext
+		});
+	};
+
+	for (const auto& outer_path : std::filesystem::directory_iterator(storage_path)) {
+		if (std::filesystem::is_regular_file(outer_path)) {
+			handle_file(outer_path);
+		} else if (std::filesystem::is_directory(outer_path)) {
+			// subdir, part of id
+			for (const auto& inner_path : std::filesystem::directory_iterator(outer_path)) {
+				//if (std::filesystem::is_regular_file(inner_path)) {
+
+					//// handle file
+				//} // TODO: support deeper recursion?
+				handle_file(inner_path);
+			}
+		}
+	}
+
+	std::cout << "FS: scan found:\n";
+	for (const auto& it : file_obj_list) {
+		std::cout << "  " << it.id_str << "\n";
+	}
+
+	// step 2: check if files preexist in reg
+	// main thread
+	// (merge into step 3 and do more error checking?)
+	// TODO: properly handle duplicates, dups form different backends might be legit
+	// important
+#if 0
+	for (auto it = file_obj_list.begin(); it != file_obj_list.end();) {
+		auto id = hex2bin(it->id_str);
+		auto fid = getFragmentByID(id);
+		if (_reg.valid(fid)) {
+			// pre exising (handle differently??)
+			// check if store differs?
+			it = file_obj_list.erase(it);
+		} else {
+			it++;
+		}
+	}
+#endif
+
+	std::vector<Object> scanned_objs;
+	// step 3: parse meta and insert into reg of non preexising
+	// main thread
+	// TODO: check timestamps of preexisting and reload? mark external/remote dirty?
+	for (const auto& it : file_obj_list) {
+		nlohmann::json j;
+		if (it.meta_ext == ".meta.msgpack") {
+			std::ifstream file(it.obj_path.generic_u8string() + it.meta_ext, std::ios::in | std::ios::binary);
+			if (!file.is_open()) {
+				std::cout << "FS error: failed opening meta " << it.obj_path << "\n";
+				continue;
+			}
+
+			// file is a msgpack within a msgpack
+
+			std::vector<uint8_t> full_meta_data;
+			{ // read meta file
+				// figure out size
+				file.seekg(0, file.end);
+				uint64_t file_size = file.tellg();
+				file.seekg(0, file.beg);
+
+				full_meta_data.resize(file_size);
+
+				file.read(reinterpret_cast<char*>(full_meta_data.data()), full_meta_data.size());
+			}
+
+			const auto meta_header_j = nlohmann::json::from_msgpack(full_meta_data, true, false);
+
+			if (!meta_header_j.is_array() || meta_header_j.size() < 4) {
+				std::cerr << "FS error: broken binary meta " << it.obj_path << "\n";
+				continue;
+			}
+
+			if (meta_header_j.at(0) != "SOLMET") {
+				std::cerr << "FS error: wrong magic '" << meta_header_j.at(0) << "' in meta " << it.obj_path << "\n";
+				continue;
+			}
+
+			Encryption meta_enc = meta_header_j.at(1);
+			if (meta_enc != Encryption::NONE) {
+				std::cerr << "FS error: unknown encryption " << it.obj_path << "\n";
+				continue;
+			}
+
+			Compression meta_comp = meta_header_j.at(2);
+			if (meta_comp != Compression::NONE && meta_comp != Compression::ZSTD) {
+				std::cerr << "FS error: unknown compression " << it.obj_path << "\n";
+				continue;
+			}
+
+			//const auto& meta_data_ref = meta_header_j.at(3).is_binary()?meta_header_j.at(3):meta_header_j.at(3).at("data");
+			if (!meta_header_j.at(3).is_binary()) {
+				std::cerr << "FS error: meta data not binary " << it.obj_path << "\n";
+				continue;
+			}
+			const nlohmann::json::binary_t& meta_data_ref = meta_header_j.at(3);
+
+			std::stack<std::unique_ptr<File2I>> binary_reader_stack;
+			binary_reader_stack.push(std::make_unique<File2MemR>(ByteSpan{meta_data_ref.data(), meta_data_ref.size()}));
+
+			if (!buildStackRead(binary_reader_stack, meta_enc, meta_comp)) {
+				std::cerr << "FS error: binary reader creation failed " << it.obj_path << "\n";
+				continue;
+			}
+
+			// HACK: read fixed amout of data, but this way if we have neither enc nor comp we pass the span through
+			auto binary_read_value = binary_reader_stack.top()->read(10*1024*1024); // is 10MiB large enough for meta?
+			const auto binary_read_span = spanFromRead(binary_read_value);
+			assert(binary_read_span.size < 10*1024*1024);
+
+			j = nlohmann::json::from_msgpack(binary_read_span, true, false);
+		} else if (it.meta_ext == ".meta.json") {
+			std::ifstream file(it.obj_path.generic_u8string() + it.meta_ext, std::ios::in | std::ios::binary);
+			if (!file.is_open()) {
+				std::cerr << "FS error: failed opening meta " << it.obj_path << "\n";
+				continue;
+			}
+
+			file >> j;
+		} else {
+			assert(false);
+		}
+
+		if (!j.is_object()) {
+			std::cerr << "FS error: json in meta is broken " << it.id_str << "\n";
+			continue;
+		}
+
+		// TODO: existing fragment file
+		//newFragmentFile();
+		ObjectHandle oh{_os.registry(), _os.registry().create()};
+		oh.emplace<ObjComp::Ephemeral::Backend>(this);
+		oh.emplace<ObjComp::ID>(hex2bin(it.id_str));
+
+		oh.emplace<ObjComp::Ephemeral::FilePath>(it.obj_path.generic_u8string());
+
+		for (const auto& [k, v] : j.items()) {
+			// type id from string hash
+			const auto type_id = entt::hashed_string(k.data(), k.size());
+			const auto deserl_fn_it = _sc._deserl_json.find(type_id);
+			if (deserl_fn_it != _sc._deserl_json.cend()) {
+				// TODO: check return value
+				deserl_fn_it->second(oh, v);
+			} else {
+				std::cerr << "FS warning: missing deserializer for meta key '" << k << "'\n";
+			}
+		}
+		scanned_objs.push_back(oh);
+	}
+
+	// TODO: mutex and move code to async and return this list ?
+
+	// throw new frag event here, after loading them all
+	for (const Object o : scanned_objs) {
+		_os.throwEventConstruct(o);
+	}
+
+	return scanned_objs.size();
+}
+
+void FilesystemStorage::scanPathAsync(std::string path) {
+	// add path to queue
+	// HACK: if path is known/any fragment is in the path, this operation blocks (non async)
+	scanPath(path); // TODO: make async and post result
+}
+
 } // backend
 
diff --git a/src/fragment_store/backends/filesystem_storage.hpp b/src/fragment_store/backends/filesystem_storage.hpp
index 715bf91d..dc0c8031 100644
--- a/src/fragment_store/backends/filesystem_storage.hpp
+++ b/src/fragment_store/backends/filesystem_storage.hpp
@@ -5,14 +5,28 @@
 namespace backend {
 
 struct FilesystemStorage : public StorageBackendI {
-	FilesystemStorage(ObjectStore2& os);
+	FilesystemStorage(ObjectStore2& os, std::string_view storage_path = "test_obj_store");
 	~FilesystemStorage(void);
 
+	// TODO: fix the path for this specific fs?
+	std::string _storage_path;
+
 	bool write(Object o, std::function<write_to_storage_fetch_data_cb>& data_cb) override;
 	bool read(Object o, std::function<read_from_storage_put_data_cb>& data_cb) override;
 
 	//// convenience function
 	//nlohmann::json loadFromStorageNJ(FragmentID fid);
+
+	void scanAsync(void);
+
+	private:
+		size_t scanPath(std::string_view path);
+		void scanPathAsync(std::string path);
+
+	private:
+		// this thing needs to change and be facilitated over the OS
+		// but the json serializer are specific to the backend
+		SerializerCallbacks<Object> _sc;
 };
 
 } // backend
diff --git a/src/fragment_store/convert_frag_to_obj.cpp b/src/fragment_store/convert_frag_to_obj.cpp
new file mode 100644
index 00000000..772d7bfa
--- /dev/null
+++ b/src/fragment_store/convert_frag_to_obj.cpp
@@ -0,0 +1,36 @@
+#include "./object_store.hpp"
+#include "./backends/filesystem_storage.hpp"
+
+#include <filesystem>
+#include <iostream>
+
+int main(int argc, const char** argv) {
+	if (argc != 3) {
+		std::cerr << "wrong paramter count, do " << argv[0] << " <input_folder> <output_folder>\n";
+		return 1;
+	}
+
+	if (!std::filesystem::is_directory(argv[1])) {
+		std::cerr << "input folder is no folder\n";
+	}
+
+	std::filesystem::create_directories(argv[2]);
+
+	// we are going to use 2 different OS for convineance, but could be done with 1 too
+	ObjectStore2 os_src;
+	ObjectStore2 os_dst;
+
+	backend::FilesystemStorage fsb_src(os_src, argv[1]);
+	backend::FilesystemStorage fsb_dst(os_dst, argv[2]);
+
+	// add message fragment store too (adds meta?)
+
+	// hookup events
+	// perform scan (which triggers events)
+	fsb_dst.scanAsync(); // fill with existing?
+	fsb_src.scanAsync(); // the scan
+
+	// done
+	return 0;
+}
+
diff --git a/src/fragment_store/fragment_store.cpp b/src/fragment_store/fragment_store.cpp
index fc2b0e36..2a349301 100644
--- a/src/fragment_store/fragment_store.cpp
+++ b/src/fragment_store/fragment_store.cpp
@@ -139,9 +139,9 @@ FragmentID FragmentStore::newFragmentFile(
 	_reg.emplace<FragComp::ID>(new_frag, id);
 
 	// file (info) comp
-	_reg.emplace<FragComp::Ephemeral::FilePath>(new_frag, fragment_file_path.generic_u8string());
+	_reg.emplace<ObjComp::Ephemeral::FilePath>(new_frag, fragment_file_path.generic_u8string());
 
-	_reg.emplace<FragComp::Ephemeral::MetaFileType>(new_frag, mft);
+	_reg.emplace<ObjComp::Ephemeral::MetaFileType>(new_frag, mft);
 
 	// meta needs to be synced to file
 	std::function<write_to_storage_fetch_data_cb> empty_data_cb = [](auto*, auto) -> uint64_t { return 0; };
@@ -188,7 +188,7 @@ bool FragmentStore::syncToStorage(FragmentID fid, std::function<write_to_storage
 		return false;
 	}
 
-	if (!_reg.all_of<FragComp::Ephemeral::FilePath>(fid)) {
+	if (!_reg.all_of<ObjComp::Ephemeral::FilePath>(fid)) {
 		// not a file fragment?
 		return false;
 	}
@@ -196,30 +196,30 @@ bool FragmentStore::syncToStorage(FragmentID fid, std::function<write_to_storage
 	// split object storage
 
 	MetaFileType meta_type = MetaFileType::TEXT_JSON; // TODO: better defaults
-	if (_reg.all_of<FragComp::Ephemeral::MetaFileType>(fid)) {
-		meta_type = _reg.get<FragComp::Ephemeral::MetaFileType>(fid).type;
+	if (_reg.all_of<ObjComp::Ephemeral::MetaFileType>(fid)) {
+		meta_type = _reg.get<ObjComp::Ephemeral::MetaFileType>(fid).type;
 	}
 
 	Encryption meta_enc = Encryption::NONE; // TODO: better defaults
 	Compression meta_comp = Compression::NONE; // TODO: better defaults
 
 	if (meta_type != MetaFileType::TEXT_JSON) {
-		if (_reg.all_of<FragComp::Ephemeral::MetaEncryptionType>(fid)) {
-			meta_enc = _reg.get<FragComp::Ephemeral::MetaEncryptionType>(fid).enc;
+		if (_reg.all_of<ObjComp::Ephemeral::MetaEncryptionType>(fid)) {
+			meta_enc = _reg.get<ObjComp::Ephemeral::MetaEncryptionType>(fid).enc;
 		}
 
-		if (_reg.all_of<FragComp::Ephemeral::MetaCompressionType>(fid)) {
-			meta_comp = _reg.get<FragComp::Ephemeral::MetaCompressionType>(fid).comp;
+		if (_reg.all_of<ObjComp::Ephemeral::MetaCompressionType>(fid)) {
+			meta_comp = _reg.get<ObjComp::Ephemeral::MetaCompressionType>(fid).comp;
 		}
 	} else {
 		// we cant have encryption or compression
 		// so we force NONE for TEXT JSON
 
-		_reg.emplace_or_replace<FragComp::Ephemeral::MetaEncryptionType>(fid, Encryption::NONE);
-		_reg.emplace_or_replace<FragComp::Ephemeral::MetaCompressionType>(fid, Compression::NONE);
+		_reg.emplace_or_replace<ObjComp::Ephemeral::MetaEncryptionType>(fid, Encryption::NONE);
+		_reg.emplace_or_replace<ObjComp::Ephemeral::MetaCompressionType>(fid, Compression::NONE);
 	}
 
-	std::filesystem::path meta_tmp_path = _reg.get<FragComp::Ephemeral::FilePath>(fid).path + ".meta" + metaFileTypeSuffix(meta_type) + ".tmp";
+	std::filesystem::path meta_tmp_path = _reg.get<ObjComp::Ephemeral::FilePath>(fid).path + ".meta" + metaFileTypeSuffix(meta_type) + ".tmp";
 	meta_tmp_path.replace_filename("." + meta_tmp_path.filename().generic_u8string());
 	// TODO: make meta comp work with mem compressor
 	//auto meta_file_stack = buildFileStackWrite(std::string_view{meta_tmp_path.generic_u8string()}, meta_enc, meta_comp);
@@ -241,7 +241,7 @@ bool FragmentStore::syncToStorage(FragmentID fid, std::function<write_to_storage
 		data_comp = _reg.get<FragComp::DataCompressionType>(fid).comp;
 	}
 
-	std::filesystem::path data_tmp_path = _reg.get<FragComp::Ephemeral::FilePath>(fid).path + ".tmp";
+	std::filesystem::path data_tmp_path = _reg.get<ObjComp::Ephemeral::FilePath>(fid).path + ".tmp";
 	data_tmp_path.replace_filename("." + data_tmp_path.filename().generic_u8string());
 	auto data_file_stack = buildFileStackWrite(std::string_view{data_tmp_path.generic_u8string()}, data_enc, data_comp);
 	if (data_file_stack.empty()) {
@@ -289,7 +289,7 @@ bool FragmentStore::syncToStorage(FragmentID fid, std::function<write_to_storage
 					std::filesystem::remove(meta_tmp_path);
 					while (!data_file_stack.empty()) { data_file_stack.pop(); }
 					std::filesystem::remove(data_tmp_path);
-					std::cerr << "FS error: binary writer creation failed '" << _reg.get<FragComp::Ephemeral::FilePath>(fid).path << "'\n";
+					std::cerr << "FS error: binary writer creation failed '" << _reg.get<ObjComp::Ephemeral::FilePath>(fid).path << "'\n";
 					return false;
 				}
 
@@ -301,7 +301,7 @@ bool FragmentStore::syncToStorage(FragmentID fid, std::function<write_to_storage
 						std::filesystem::remove(meta_tmp_path);
 						while (!data_file_stack.empty()) { data_file_stack.pop(); }
 						std::filesystem::remove(data_tmp_path);
-						std::cerr << "FS error: binary writer failed '" << _reg.get<FragComp::Ephemeral::FilePath>(fid).path << "'\n";
+						std::cerr << "FS error: binary writer failed '" << _reg.get<ObjComp::Ephemeral::FilePath>(fid).path << "'\n";
 						return false;
 					}
 				}
@@ -361,18 +361,18 @@ bool FragmentStore::syncToStorage(FragmentID fid, std::function<write_to_storage
 
 	std::filesystem::rename(
 		meta_tmp_path,
-		_reg.get<FragComp::Ephemeral::FilePath>(fid).path + ".meta" + metaFileTypeSuffix(meta_type)
+		_reg.get<ObjComp::Ephemeral::FilePath>(fid).path + ".meta" + metaFileTypeSuffix(meta_type)
 	);
 
 	std::filesystem::rename(
 		data_tmp_path,
-		_reg.get<FragComp::Ephemeral::FilePath>(fid).path
+		_reg.get<ObjComp::Ephemeral::FilePath>(fid).path
 	);
 
 	// TODO: check return value of renames
 
-	if (_reg.all_of<FragComp::Ephemeral::DirtyTag>(fid)) {
-		_reg.remove<FragComp::Ephemeral::DirtyTag>(fid);
+	if (_reg.all_of<ObjComp::Ephemeral::DirtyTag>(fid)) {
+		_reg.remove<ObjComp::Ephemeral::DirtyTag>(fid);
 	}
 
 	return true;
@@ -396,13 +396,13 @@ bool FragmentStore::loadFromStorage(FragmentID fid, std::function<read_from_stor
 		return false;
 	}
 
-	if (!_reg.all_of<FragComp::Ephemeral::FilePath>(fid)) {
+	if (!_reg.all_of<ObjComp::Ephemeral::FilePath>(fid)) {
 		// not a file fragment?
 		// TODO: memory fragments
 		return false;
 	}
 
-	const auto& frag_path = _reg.get<FragComp::Ephemeral::FilePath>(fid).path;
+	const auto& frag_path = _reg.get<ObjComp::Ephemeral::FilePath>(fid).path;
 
 	// TODO: check if metadata dirty?
 	// TODO: what if file changed on disk?
@@ -672,7 +672,7 @@ size_t FragmentStore::scanStoragePath(std::string_view path) {
 		FragmentHandle fh{_reg, _reg.create()};
 		fh.emplace<FragComp::ID>(hex2bin(it.id_str));
 
-		fh.emplace<FragComp::Ephemeral::FilePath>(it.frag_path.generic_u8string());
+		fh.emplace<ObjComp::Ephemeral::FilePath>(it.frag_path.generic_u8string());
 
 		for (const auto& [k, v] : j.items()) {
 			// type id from string hash
diff --git a/src/fragment_store/fragment_store.hpp b/src/fragment_store/fragment_store.hpp
index d29bff60..5982f70e 100644
--- a/src/fragment_store/fragment_store.hpp
+++ b/src/fragment_store/fragment_store.hpp
@@ -94,9 +94,5 @@ struct FragmentStore : public FragmentStoreI {
 
 	private:
 		void registerSerializers(void); // internal comps
-		// internal actual backends
-		// TODO: seperate out
-		bool syncToMemory(FragmentID fid, std::function<write_to_storage_fetch_data_cb>& data_cb);
-		bool syncToFile(FragmentID fid, std::function<write_to_storage_fetch_data_cb>& data_cb);
 };
 
diff --git a/src/fragment_store/message_fragment_store.cpp b/src/fragment_store/message_fragment_store.cpp
index a189972d..ce0b1ebe 100644
--- a/src/fragment_store/message_fragment_store.cpp
+++ b/src/fragment_store/message_fragment_store.cpp
@@ -68,7 +68,7 @@ namespace Message::Components {
 
 } // Message::Components
 
-namespace Fragment::Components {
+namespace ObjectStore::Components {
 	NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(MessagesTSRange, begin, end)
 	NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(MessagesContact, id)
 
@@ -82,7 +82,7 @@ namespace Fragment::Components {
 			Contact3 e {entt::null};
 		};
 	}
-} // Fragment::Component
+} // ObjectStore::Component
 
 void MessageFragmentStore::handleMessage(const Message3Handle& m) {
 	if (_fs_ignore_event) {
@@ -133,7 +133,7 @@ void MessageFragmentStore::handleMessage(const Message3Handle& m) {
 			assert(static_cast<bool>(fh));
 
 			// assuming ts range exists
-			auto& fts_comp = fh.get<FragComp::MessagesTSRange>();
+			auto& fts_comp = fh.get<ObjComp::MessagesTSRange>();
 
 			if (fts_comp.begin <= msg_ts && fts_comp.end >= msg_ts) {
 				fragment_id = fid;
@@ -149,7 +149,7 @@ void MessageFragmentStore::handleMessage(const Message3Handle& m) {
 				assert(static_cast<bool>(fh));
 
 				// assuming ts range exists
-				auto& fts_comp = fh.get<FragComp::MessagesTSRange>();
+				auto& fts_comp = fh.get<ObjComp::MessagesTSRange>();
 
 				const int64_t frag_range = int64_t(fts_comp.end) - int64_t(fts_comp.begin);
 				constexpr static int64_t max_frag_ts_extent {1000*60*60};
@@ -205,17 +205,17 @@ void MessageFragmentStore::handleMessage(const Message3Handle& m) {
 
 			fragment_id = fh;
 
-			fh.emplace_or_replace<FragComp::Ephemeral::MetaCompressionType>().comp = Compression::ZSTD;
-			fh.emplace_or_replace<FragComp::DataCompressionType>().comp = Compression::ZSTD;
+			fh.emplace_or_replace<ObjComp::Ephemeral::MetaCompressionType>().comp = Compression::ZSTD;
+			fh.emplace_or_replace<ObjComp::DataCompressionType>().comp = Compression::ZSTD;
 
-			auto& new_ts_range = fh.emplace_or_replace<FragComp::MessagesTSRange>();
+			auto& new_ts_range = fh.emplace_or_replace<ObjComp::MessagesTSRange>();
 			new_ts_range.begin = msg_ts;
 			new_ts_range.end = msg_ts;
 
 			{
 				const auto msg_reg_contact = m.registry()->ctx().get<Contact3>();
 				if (_cr.all_of<Contact::Components::ID>(msg_reg_contact)) {
-					fh.emplace<FragComp::MessagesContact>(_cr.get<Contact::Components::ID>(msg_reg_contact).data);
+					fh.emplace<ObjComp::MessagesContact>(_cr.get<Contact::Components::ID>(msg_reg_contact).data);
 				} else {
 					// ? rage quit?
 				}
@@ -235,7 +235,7 @@ void MessageFragmentStore::handleMessage(const Message3Handle& m) {
 
 			fid_open.emplace(fragment_id);
 
-			std::cout << "MFS: created new fragment " << bin2hex(fh.get<FragComp::ID>().v) << "\n";
+			std::cout << "MFS: created new fragment " << bin2hex(fh.get<ObjComp::ID>().v) << "\n";
 
 			_fs_ignore_event = true;
 			_fs.throwEventConstruct(fh);
@@ -296,13 +296,13 @@ void MessageFragmentStore::loadFragment(Message3Registry& reg, FragmentHandle fh
 
 	if (!j.is_array()) {
 		// wrong data
-		fh.emplace_or_replace<FragComp::Ephemeral::MessagesEmptyTag>();
+		fh.emplace_or_replace<ObjComp::Ephemeral::MessagesEmptyTag>();
 		return;
 	}
 
 	if (j.size() == 0) {
 		// empty array
-		fh.emplace_or_replace<FragComp::Ephemeral::MessagesEmptyTag>();
+		fh.emplace_or_replace<ObjComp::Ephemeral::MessagesEmptyTag>();
 		return;
 	}
 
@@ -389,12 +389,12 @@ void MessageFragmentStore::loadFragment(Message3Registry& reg, FragmentHandle fh
 	if (messages_new_or_updated == 0) {
 		// useless frag
 		// TODO: unload?
-		fh.emplace_or_replace<FragComp::Ephemeral::MessagesEmptyTag>();
+		fh.emplace_or_replace<ObjComp::Ephemeral::MessagesEmptyTag>();
 	}
 }
 
 bool MessageFragmentStore::syncFragToStorage(FragmentHandle fh, Message3Registry& reg) {
-	auto& ftsrange = fh.get_or_emplace<FragComp::MessagesTSRange>(Message::getTimeMS(), Message::getTimeMS());
+	auto& ftsrange = fh.get_or_emplace<ObjComp::MessagesTSRange>(Message::getTimeMS(), Message::getTimeMS());
 
 	auto j = nlohmann::json::array();
 
@@ -476,10 +476,16 @@ MessageFragmentStore::MessageFragmentStore(
 	_rmm.subscribe(this, RegistryMessageModel_Event::message_updated);
 	_rmm.subscribe(this, RegistryMessageModel_Event::message_destroy);
 
-	_fs._sc.registerSerializerJson<FragComp::MessagesTSRange>();
-	_fs._sc.registerDeSerializerJson<FragComp::MessagesTSRange>();
-	_fs._sc.registerSerializerJson<FragComp::MessagesContact>();
-	_fs._sc.registerDeSerializerJson<FragComp::MessagesContact>();
+	_fs._sc.registerSerializerJson<ObjComp::MessagesTSRange>();
+	_fs._sc.registerDeSerializerJson<ObjComp::MessagesTSRange>();
+	_fs._sc.registerSerializerJson<ObjComp::MessagesContact>();
+	_fs._sc.registerDeSerializerJson<ObjComp::MessagesContact>();
+
+	// old
+	_fs._sc.registerSerializerJson<FragComp::MessagesTSRange>(_fs._sc.component_get_json<ObjComp::MessagesTSRange>);
+	_fs._sc.registerDeSerializerJson<FragComp::MessagesTSRange>(_fs._sc.component_emplace_or_replace_json<ObjComp::MessagesTSRange>);
+	_fs._sc.registerSerializerJson<FragComp::MessagesContact>(_fs._sc.component_get_json<ObjComp::MessagesContact>);
+	_fs._sc.registerDeSerializerJson<FragComp::MessagesContact>(_fs._sc.component_emplace_or_replace_json<ObjComp::MessagesContact>);
 
 	_fs.subscribe(this, FragmentStore_Event::fragment_construct);
 	_fs.subscribe(this, FragmentStore_Event::fragment_updated);
@@ -589,12 +595,12 @@ float MessageFragmentStore::tick(float) {
 			return 0.05f;
 		}
 
-		if (!fh.all_of<FragComp::MessagesTSRange>()) {
+		if (!fh.all_of<ObjComp::MessagesTSRange>()) {
 			return 0.05f;
 		}
 
 		// get ts range of frag and collide with all curser(s/ranges)
-		const auto& frag_range = fh.get<FragComp::MessagesTSRange>();
+		const auto& frag_range = fh.get<ObjComp::MessagesTSRange>();
 
 		auto* msg_reg = _rmm.get(c);
 		if (msg_reg == nullptr) {
@@ -646,19 +652,19 @@ float MessageFragmentStore::tick(float) {
 						return 0.05f;
 					}
 
-					if (!fh.all_of<FragComp::MessagesTSRange>()) {
+					if (!fh.all_of<ObjComp::MessagesTSRange>()) {
 						std::cerr << "MFS error: frag has no range\n";
 						// ????
 						msg_reg->ctx().get<Message::Components::ContactFragments>().erase(fid);
 						return 0.05f;
 					}
 
-					if (fh.all_of<FragComp::Ephemeral::MessagesEmptyTag>()) {
+					if (fh.all_of<ObjComp::Ephemeral::MessagesEmptyTag>()) {
 						continue; // skip known empty
 					}
 
 					// get ts range of frag and collide with all curser(s/ranges)
-					const auto& [range_begin, range_end] = fh.get<FragComp::MessagesTSRange>();
+					const auto& [range_begin, range_end] = fh.get<ObjComp::MessagesTSRange>();
 
 					if (rangeVisible(range_begin, range_end, *msg_reg)) {
 						std::cout << "MFS: frag hit by vis range\n";
@@ -691,7 +697,7 @@ float MessageFragmentStore::tick(float) {
 							cf.sorted_end.crend(),
 							ts_begin_comp.ts,
 							[&](const FragmentID element, const auto& value) -> bool {
-								return _fs._reg.get<FragComp::MessagesTSRange>(element).end >= value;
+								return _fs._reg.get<ObjComp::MessagesTSRange>(element).end >= value;
 							}
 						);
 
@@ -709,7 +715,7 @@ float MessageFragmentStore::tick(float) {
 						// only ok bc next is cheap
 						for (size_t i = 0; i < 5 && _fs._reg.valid(next_frag); next_frag = cf.next(next_frag)) {
 							auto fh = _fs.fragmentHandle(next_frag);
-							if (fh.any_of<FragComp::Ephemeral::MessagesEmptyTag>()) {
+							if (fh.any_of<ObjComp::Ephemeral::MessagesEmptyTag>()) {
 								continue; // skip known empty
 							}
 
@@ -739,7 +745,7 @@ float MessageFragmentStore::tick(float) {
 							cf.sorted_begin.cend(),
 							ts_end,
 							[&](const FragmentID element, const auto& value) -> bool {
-								return _fs._reg.get<FragComp::MessagesTSRange>(element).begin < value;
+								return _fs._reg.get<ObjComp::MessagesTSRange>(element).begin < value;
 							}
 						);
 
@@ -757,7 +763,7 @@ float MessageFragmentStore::tick(float) {
 						// only ok bc next is cheap
 						for (size_t i = 0; i < 5 && _fs._reg.valid(prev_frag); prev_frag = cf.prev(prev_frag)) {
 							auto fh = _fs.fragmentHandle(prev_frag);
-							if (fh.any_of<FragComp::Ephemeral::MessagesEmptyTag>()) {
+							if (fh.any_of<ObjComp::Ephemeral::MessagesEmptyTag>()) {
 								continue; // skip known empty
 							}
 
@@ -806,7 +812,7 @@ bool MessageFragmentStore::onEvent(const Fragment::Events::FragmentConstruct& e)
 		return false; // skip self
 	}
 
-	if (!e.e.all_of<FragComp::MessagesTSRange, FragComp::MessagesContact>()) {
+	if (!e.e.all_of<ObjComp::MessagesTSRange, ObjComp::MessagesContact>()) {
 		return false; // not for us
 	}
 
@@ -814,7 +820,7 @@ bool MessageFragmentStore::onEvent(const Fragment::Events::FragmentConstruct& e)
 
 	Contact3 frag_contact = entt::null;
 	{ // get contact
-		const auto& frag_contact_id = e.e.get<FragComp::MessagesContact>().id;
+		const auto& frag_contact_id = e.e.get<ObjComp::MessagesContact>().id;
 		// TODO: id lookup table, this is very inefficent
 		for (const auto& [c_it, id_it] : _cr.view<Contact::Components::ID>().each()) {
 			if (frag_contact_id == id_it.data) {
@@ -826,7 +832,7 @@ bool MessageFragmentStore::onEvent(const Fragment::Events::FragmentConstruct& e)
 			// unkown contact
 			return false;
 		}
-		e.e.emplace_or_replace<FragComp::Ephemeral::MessagesContactEntity>(frag_contact);
+		e.e.emplace_or_replace<ObjComp::Ephemeral::MessagesContactEntity>(frag_contact);
 	}
 
 	// create if not exist
@@ -853,23 +859,23 @@ bool MessageFragmentStore::onEvent(const Fragment::Events::FragmentUpdated& e) {
 		return false; // skip self
 	}
 
-	if (!e.e.all_of<FragComp::MessagesTSRange, FragComp::MessagesContact>()) {
+	if (!e.e.all_of<ObjComp::MessagesTSRange, ObjComp::MessagesContact>()) {
 		return false; // not for us
 	}
 
 	// since its an update, we might have it associated, or not
 	// its also possible it was tagged as empty
-	e.e.remove<FragComp::Ephemeral::MessagesEmptyTag>();
+	e.e.remove<ObjComp::Ephemeral::MessagesEmptyTag>();
 
 	Contact3 frag_contact = entt::null;
 	{ // get contact
 		// probably cached already
-		if (e.e.all_of<FragComp::Ephemeral::MessagesContactEntity>()) {
-			frag_contact = e.e.get<FragComp::Ephemeral::MessagesContactEntity>().e;
+		if (e.e.all_of<ObjComp::Ephemeral::MessagesContactEntity>()) {
+			frag_contact = e.e.get<ObjComp::Ephemeral::MessagesContactEntity>().e;
 		}
 
 		if (!_cr.valid(frag_contact)) {
-			const auto& frag_contact_id = e.e.get<FragComp::MessagesContact>().id;
+			const auto& frag_contact_id = e.e.get<ObjComp::MessagesContact>().id;
 			// TODO: id lookup table, this is very inefficent
 			for (const auto& [c_it, id_it] : _cr.view<Contact::Components::ID>().each()) {
 				if (frag_contact_id == id_it.data) {
@@ -881,7 +887,7 @@ bool MessageFragmentStore::onEvent(const Fragment::Events::FragmentUpdated& e) {
 				// unkown contact
 				return false;
 			}
-			e.e.emplace_or_replace<FragComp::Ephemeral::MessagesContactEntity>(frag_contact);
+			e.e.emplace_or_replace<ObjComp::Ephemeral::MessagesContactEntity>(frag_contact);
 		}
 	}
 
@@ -921,15 +927,15 @@ bool Message::Components::ContactFragments::insert(FragmentHandle frag) {
 			sorted_begin.cbegin(),
 			sorted_begin.cend(),
 			[frag](const FragmentID a) -> bool {
-				const auto begin_a = frag.registry()->get<FragComp::MessagesTSRange>(a).begin;
-				const auto begin_frag = frag.get<FragComp::MessagesTSRange>().begin;
+				const auto begin_a = frag.registry()->get<ObjComp::MessagesTSRange>(a).begin;
+				const auto begin_frag = frag.get<ObjComp::MessagesTSRange>().begin;
 				if (begin_a > begin_frag) {
 					return true;
 				} else if (begin_a < begin_frag) {
 					return false;
 				} else {
 					// equal ts, we need to fall back to id (id can not be equal)
-					return isLess(frag.get<FragComp::ID>().v, frag.registry()->get<FragComp::ID>(a).v);
+					return isLess(frag.get<ObjComp::ID>().v, frag.registry()->get<ObjComp::ID>(a).v);
 				}
 			}
 		);
@@ -946,15 +952,15 @@ bool Message::Components::ContactFragments::insert(FragmentHandle frag) {
 			sorted_end.cbegin(),
 			sorted_end.cend(),
 			[frag](const FragmentID a) -> bool {
-				const auto end_a = frag.registry()->get<FragComp::MessagesTSRange>(a).end;
-				const auto end_frag = frag.get<FragComp::MessagesTSRange>().end;
+				const auto end_a = frag.registry()->get<ObjComp::MessagesTSRange>(a).end;
+				const auto end_frag = frag.get<ObjComp::MessagesTSRange>().end;
 				if (end_a > end_frag) {
 					return true;
 				} else if (end_a < end_frag) {
 					return false;
 				} else {
 					// equal ts, we need to fall back to id (id can not be equal)
-					return isLess(frag.get<FragComp::ID>().v, frag.registry()->get<FragComp::ID>(a).v);
+					return isLess(frag.get<ObjComp::ID>().v, frag.registry()->get<ObjComp::ID>(a).v);
 				}
 			}
 		);
diff --git a/src/fragment_store/message_fragment_store.hpp b/src/fragment_store/message_fragment_store.hpp
index ac3813a5..179ece15 100644
--- a/src/fragment_store/message_fragment_store.hpp
+++ b/src/fragment_store/message_fragment_store.hpp
@@ -54,7 +54,7 @@ namespace Message::Components {
 
 } // Message::Components
 
-namespace Fragment::Components {
+namespace ObjectStore::Components {
 	struct MessagesTSRange {
 		// timestamp range within the fragment
 		uint64_t begin {0}; // newer msg -> higher number
@@ -67,6 +67,12 @@ namespace Fragment::Components {
 
 	// TODO: add src contact (self id)
 
+} // ObjectStore::Components
+
+// old
+namespace Fragment::Components {
+	struct MessagesTSRange : public ObjComp::MessagesTSRange {};
+	struct MessagesContact : public ObjComp::MessagesContact {};
 } // Fragment::Components
 
 // handles fragments for messages
diff --git a/src/fragment_store/meta_components.hpp b/src/fragment_store/meta_components.hpp
index a8ec20e5..f0dcf57a 100644
--- a/src/fragment_store/meta_components.hpp
+++ b/src/fragment_store/meta_components.hpp
@@ -1,12 +1,13 @@
 #pragma once
 
 #include "./types.hpp"
+#include "object_store.hpp"
 
 #include <vector>
 #include <string>
 #include <cstdint>
 
-namespace Fragment::Components {
+namespace ObjectStore::Components {
 
 	// TODO: is this special and should this be saved to meta or not (its already in the file name on disk)
 	struct ID {
@@ -25,18 +26,6 @@ namespace Fragment::Components {
 	// meta that is not written to (meta-)file
 	namespace Ephemeral {
 
-		// excluded from file meta
-		struct FilePath {
-			// contains store path, if any
-			std::string path;
-		};
-
-		// TODO: seperate into remote and local?
-		// (remote meaning eg. the file on disk was changed by another program)
-		struct DirtyTag {};
-
-
-		// type as comp
 		struct MetaFileType {
 			::MetaFileType type {::MetaFileType::TEXT_JSON};
 		};
@@ -49,11 +38,38 @@ namespace Fragment::Components {
 			Compression comp {Compression::NONE};
 		};
 
+		struct Backend {
+			// TODO: shared_ptr instead??
+			StorageBackendI* ptr;
+		};
+
+		// excluded from file meta
+		// TODO: move to backend specific
+		struct FilePath {
+			// contains store path, if any
+			std::string path;
+		};
+
+		// TODO: seperate into remote and local?
+		// (remote meaning eg. the file on disk was changed by another program)
+		struct DirtyTag {};
+
 	} // Ephemeral
 
 } // Components
 
 // shortened to save bytes (until I find a way to save by ID in msgpack)
+namespace ObjComp = ObjectStore::Components;
+
+// old names
+namespace Fragment::Components {
+	//struct ID {};
+	//struct DataEncryptionType {};
+	//struct DataCompressionType {};
+	struct ID : public ObjComp::ID {};
+	struct DataEncryptionType : public ObjComp::DataEncryptionType {};
+	struct DataCompressionType : public ObjComp::DataCompressionType {};
+}
 namespace FragComp = Fragment::Components;
 
 #include "./meta_components_id.inl"
diff --git a/src/fragment_store/meta_components_id.inl b/src/fragment_store/meta_components_id.inl
index c912cce7..d9f7de37 100644
--- a/src/fragment_store/meta_components_id.inl
+++ b/src/fragment_store/meta_components_id.inl
@@ -18,6 +18,10 @@ constexpr std::string_view entt::type_name<x>::value() noexcept { \
 
 // cross compiler stable ids
 
+DEFINE_COMP_ID(ObjComp::DataEncryptionType)
+DEFINE_COMP_ID(ObjComp::DataCompressionType)
+
+// old stuff
 DEFINE_COMP_ID(FragComp::DataEncryptionType)
 DEFINE_COMP_ID(FragComp::DataCompressionType)
 
diff --git a/src/fragment_store/object_store.cpp b/src/fragment_store/object_store.cpp
index 4fc77860..146f6778 100644
--- a/src/fragment_store/object_store.cpp
+++ b/src/fragment_store/object_store.cpp
@@ -22,43 +22,7 @@ bool StorageBackendI::write(Object o, const ByteSpan data) {
 	return write(o, fn_cb);
 }
 
-static bool serl_json_data_enc_type(const ObjectHandle oh, nlohmann::json& out) {
-	out = static_cast<std::underlying_type_t<Encryption>>(
-		oh.get<FragComp::DataEncryptionType>().enc
-	);
-	return true;
-}
-
-static bool deserl_json_data_enc_type(ObjectHandle oh, const nlohmann::json& in) {
-	oh.emplace_or_replace<FragComp::DataEncryptionType>(
-		static_cast<Encryption>(
-			static_cast<std::underlying_type_t<Encryption>>(in)
-		)
-	);
-	return true;
-}
-
-static bool serl_json_data_comp_type(const ObjectHandle oh, nlohmann::json& out) {
-	out = static_cast<std::underlying_type_t<Compression>>(
-		oh.get<FragComp::DataCompressionType>().comp
-	);
-	return true;
-}
-
-static bool deserl_json_data_comp_type(ObjectHandle oh, const nlohmann::json& in) {
-	oh.emplace_or_replace<FragComp::DataCompressionType>(
-		static_cast<Compression>(
-			static_cast<std::underlying_type_t<Compression>>(in)
-		)
-	);
-	return true;
-}
-
 ObjectStore2::ObjectStore2(void) {
-	_sc.registerSerializerJson<FragComp::DataEncryptionType>(serl_json_data_enc_type);
-	_sc.registerDeSerializerJson<FragComp::DataEncryptionType>(deserl_json_data_enc_type);
-	_sc.registerSerializerJson<FragComp::DataCompressionType>(serl_json_data_comp_type);
-	_sc.registerDeSerializerJson<FragComp::DataCompressionType>(deserl_json_data_comp_type);
 }
 
 ObjectStore2::~ObjectStore2(void) {
diff --git a/src/fragment_store/object_store.hpp b/src/fragment_store/object_store.hpp
index bcfff21f..3ce56bbd 100644
--- a/src/fragment_store/object_store.hpp
+++ b/src/fragment_store/object_store.hpp
@@ -75,8 +75,6 @@ struct ObjectStore2 : public ObjectStoreEventProviderI {
 
 	ObjectRegistry _reg;
 
-	SerializerCallbacks<Object> _sc;
-
 	// TODO: default backend?
 
 	ObjectStore2(void);