WRITER { VERIFY | EXCLUDE } VERIFY Specify that the backup or restore operation must fail if the writer or component is not ...

WRITER { VERIFY | EXCLUDE } 

        VERIFY                  Specify that the backup or restore operation must fail if the writer or component is not included.
        EXCLUDE                 Exclude the specified writer or component from the backup/restore.

        Example: WRITER VERIFY  {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
                 WRITER EXCLUDE {e8132975-6f93-4464-a53e-1050253ae220}