Architecture for synchronizing data between business applications according to a multi-master arrangement. Changes to business entities can be snapshot changes, delta changes, and long-running process changes, the latter which can be derived from the first two. The architecture includes automatic error retry logic, such that when synchronization errors occur, the logic can be replayed to resolve the errors, when conditions have changed where the errors can be resolved. This also applies to when one error causes a cascading set of errors. By replaying one error, the other errors will be resolved. Backup and restore of a participating application is also provided such that a new data change in a non-backup-restored application will automatically be synchronized to the recently-restored system.