Synchronization Phase
During a backup or restore operation, the synchronization phase is where cleanup tasks such as deleting temporary files takes place, leaving the database in a consistent state. During a restore operation, the synchronization phase also takes the old version of the database offline and replaces it with the newly restored version.
Note
Any “cold” administrative tasks (tasks that require a server restart) will cause any backup or restore operations to fail. Do not perform any “cold” administrative tasks during a backup or restore operation. For a list of “hot” and “cold” operations, see Appendix A: ‘Hot’ versus ‘Cold’ Admin Tasks.