Backup, CHECKALLOC, bulk copy, SELECT INTO, and file manipulation (such as CREATE FILE) operations on a database must be serialized. Reissue the statement after the current backup, CHECKALLOC, or file manipulation operation is completed.
These operations may not be performed at the same time as a backup operation:
If a backup is started when one of these operations is in progress, the backup ends. If a backup is running and one of these operations is attempted, the operation fails. For more information, see Remarks in BACKUP.
Reissue the operation after the conflicting operation has completed.