Differential incremental backup taken after a restore fails for EV 7.5 and later versions
Run a full backup and perform a restore of the backup image. Then, run a differential incremental backup, the backup fails with error 13.
The reason for the backup failure is that the NetBackup Enterprise Vault Agent's use of the Backup Exec SQL Agent code change (for DB backups) does not allow incremental backups until a new full backup is complete after the restore. So when a differential incremental backup is run, the backup is treated as a new database, wherein you are required to first run a full backup and then the differential incremental backup. A restore should not be done before the incremental backup.
Note:
An incremental backup after a full restore was allowed in the earlier versions of NetBackup. The failure of the incremental backup failure after a full restore has been observed in the NetBackup 7.5.