diff --git a/client/lib/src/client.dart b/client/lib/src/client.dart
index b3200c2..e8288c0 100644
--- a/client/lib/src/client.dart
+++ b/client/lib/src/client.dart
@@ -436,7 +436,7 @@ class MusicusClient {
     ));
 
     final json = jsonDecode(response.body);
-    return json.map<WorkInfo>((j) => WorkInfo.fromJson(j)).toList();
+    return json.map<WorkInfo>((j) => WorkInfo.fromJson(j, sync: true)).toList();
   }
 
   /// Get a work by ID.
@@ -446,7 +446,7 @@ class MusicusClient {
     ));
 
     final json = jsonDecode(response.body);
-    return WorkInfo.fromJson(json);
+    return WorkInfo.fromJson(json, sync: true);
   }
 
   /// Delete a work by ID.
@@ -475,7 +475,9 @@ class MusicusClient {
     ));
 
     final json = jsonDecode(response.body);
-    return json.map<RecordingInfo>((j) => RecordingInfo.fromJson(j)).toList();
+    return json
+        .map<RecordingInfo>((j) => RecordingInfo.fromJson(j, sync: true))
+        .toList();
   }
 
   /// Create or update a work.
@@ -570,7 +572,7 @@ class MusicusClient {
     ));
 
     final json = jsonDecode(response.body);
-    return RecordingInfo.fromJson(json);
+    return RecordingInfo.fromJson(json, sync: true);
   }
 
   /// Create or update a recording.
diff --git a/client/lib/src/database.dart b/client/lib/src/database.dart
index 7283f2f..8293adf 100644
--- a/client/lib/src/database.dart
+++ b/client/lib/src/database.dart
@@ -120,7 +120,7 @@ class MusicusClientDatabase extends _$MusicusClientDatabase {
       mode: InsertMode.insertOrReplace,
     );
 
-    if (person.sync) {
+    if (person.sync && !person.synced) {
       await client.putPerson(person);
       await updatePerson(person.copyWith(synced: true));
     }
@@ -164,7 +164,7 @@ class MusicusClientDatabase extends _$MusicusClientDatabase {
       mode: InsertMode.insertOrReplace,
     );
 
-    if (instrument.sync) {
+    if (instrument.sync && !instrument.synced) {
       await client.putInstrument(instrument);
       await updateInstrument(instrument.copyWith(synced: true));
     }
@@ -296,7 +296,7 @@ class MusicusClientDatabase extends _$MusicusClientDatabase {
       }
     });
 
-    if (workInfo.work.sync) {
+    if (workInfo.work.sync && !workInfo.work.synced) {
       await client.putWork(workInfo);
       await into(works)
           .insertOnConflictUpdate(workInfo.work.copyWith(synced: true));
@@ -343,7 +343,7 @@ class MusicusClientDatabase extends _$MusicusClientDatabase {
       mode: InsertMode.insertOrReplace,
     );
 
-    if (ensemble.sync) {
+    if (ensemble.sync && !ensemble.synced) {
       await client.putEnsemble(ensemble);
       await updateEnsemble(ensemble.copyWith(synced: true));
     }
@@ -397,7 +397,7 @@ class MusicusClientDatabase extends _$MusicusClientDatabase {
       }
     });
 
-    if (recordingInfo.recording.sync) {
+    if (recordingInfo.recording.sync && !recordingInfo.recording.synced) {
       await client.putRecording(recordingInfo);
       await into(recordings).insertOnConflictUpdate(
           recordingInfo.recording.copyWith(synced: true));
diff --git a/client/lib/src/info.dart b/client/lib/src/info.dart
index d337b3d..c9bd3bf 100644
--- a/client/lib/src/info.dart
+++ b/client/lib/src/info.dart
@@ -67,13 +67,30 @@ class WorkInfo {
     this.sections,
   });
 
-  factory WorkInfo.fromJson(Map<String, dynamic> json) => WorkInfo(
-        work: Work.fromJson(json['work']),
+  /// Deserialize work info from JSON.
+  ///
+  /// If [sync] is set to true, all contained items will have their sync
+  /// property set to true.
+  // TODO: Local versions should not be overriden, if their sync property is
+  // set to false.
+  factory WorkInfo.fromJson(Map<String, dynamic> json, {bool sync = false}) =>
+      WorkInfo(
+        work: Work.fromJson(json['work']).copyWith(
+          sync: sync,
+          synced: sync,
+        ),
         instruments: json['instruments']
-            .map<Instrument>((j) => Instrument.fromJson(j))
+            .map<Instrument>((j) => Instrument.fromJson(j).copyWith(
+                  sync: sync,
+                  synced: sync,
+                ))
+            .toList(),
+        composers: json['composers']
+            .map<Person>((j) => Person.fromJson(j).copyWith(
+                  sync: sync,
+                  synced: sync,
+                ))
             .toList(),
-        composers:
-            json['composers'].map<Person>((j) => Person.fromJson(j)).toList(),
         parts:
             json['parts'].map<PartInfo>((j) => PartInfo.fromJson(j)).toList(),
         sections: json['sections']
@@ -111,13 +128,27 @@ class PerformanceInfo {
     this.role,
   });
 
-  factory PerformanceInfo.fromJson(Map<String, dynamic> json) =>
+  factory PerformanceInfo.fromJson(Map<String, dynamic> json,
+          {bool sync = false}) =>
       PerformanceInfo(
-        person: json['person'] != null ? Person.fromJson(json['person']) : null,
-        ensemble: json['ensemble'] != null
-            ? Ensemble.fromJson(json['ensemble'])
+        person: json['person'] != null
+            ? Person.fromJson(json['person']).copyWith(
+                sync: sync,
+                synced: sync,
+              )
+            : null,
+        ensemble: json['ensemble'] != null
+            ? Ensemble.fromJson(json['ensemble']).copyWith(
+                sync: sync,
+                synced: sync,
+              )
+            : null,
+        role: json['role'] != null
+            ? Instrument.fromJson(json['role']).copyWith(
+                sync: sync,
+                synced: sync,
+              )
             : null,
-        role: json['role'] != null ? Instrument.fromJson(json['role']) : null,
       );
 
   Map<String, dynamic> toJson() => {
@@ -143,10 +174,22 @@ class RecordingInfo {
     this.performances,
   });
 
-  factory RecordingInfo.fromJson(Map<String, dynamic> json) => RecordingInfo(
-        recording: Recording.fromJson(json['recording']),
+  /// Deserialize recording info from JSON.
+  ///
+  /// If [sync] is set to true, all contained items will have their sync
+  /// property set to true.
+  // TODO: Local versions should not be overriden, if their sync property is
+  // set to false.
+  factory RecordingInfo.fromJson(Map<String, dynamic> json,
+          {bool sync = false}) =>
+      RecordingInfo(
+        recording: Recording.fromJson(json['recording']).copyWith(
+          sync: sync,
+          synced: sync,
+        ),
         performances: json['performances']
-            .map<PerformanceInfo>((j) => PerformanceInfo.fromJson(j))
+            .map<PerformanceInfo>(
+                (j) => PerformanceInfo.fromJson(j, sync: sync))
             .toList(),
       );