The troubleshoot for this problem is to wider the backup window in the backup policy or to upgrade the backup hardware capacity. It's better to reduce the error possibility which lead the media/device to be longer used by one backup/archive job.
From the Netbackup best practice, try the following:
- If possible, change the schedule to extend the backup window for this policy and schedule combination so it does not occur again.
- If the backup must be run, use the Manual Backup command on the Policy menu in the Backup Policy Management window to perform the backup. Manual backups ignore the backup window.