diff --git a/backend/src/Squidex.Domain.Apps.Entities/Contents/BackupContents.cs b/backend/src/Squidex.Domain.Apps.Entities/Contents/BackupContents.cs
index 5ae25f21a..0929d533e 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Contents/BackupContents.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Contents/BackupContents.cs
@@ -85,7 +85,7 @@ namespace Squidex.Domain.Apps.Entities.Contents
                     contentIdsBySchemaId.Remove(schemaDeleted.SchemaId.Id);
                     break;
                 case ContentCreated contentCreated:
-                    contentIdsBySchemaId.GetOrAddNew(contentCreated.SchemaId.Id).Add(contentCreated.ContentId);
+                    contentIdsBySchemaId.GetOrAddNew(contentCreated.SchemaId.Id).Add(@event.Headers.AggregateId());
 
                     if (assetsUrlNew != null && assetsUrlOld != null)
                     {