Storix Software SBAdmin TSM Edition Users Guide - Manual (Page 66)

Storix System Backup Administrator 66 Version 8.2 TSM Edition User Guide
Manually Expiring a Backup
To manually expire a backup, first perform any one of the various methods to view the backup label . Then
select the Expire/Remove button at the bottom of the screen.
Automatic Expiration of Backups
The Backup Retention Policies determines if and when an old backup may be overwritten by a new backup.
Any time an old backup is overwritten by a new one, the previous backup label must be expired as the data
the label points to will no longer exist.
For tape backups, if the Tape Overwrite/Retention Policy has been set to allow current labels to be
overwritten by new backup jobs, the backup being overwritten will be
automatically expired, allowing the
tape to be overwritten by a new backup.
For TSM backups, expiration of the backup label also means removing the actual backup image files from
the server. The TSM Backup Retention Policy determines when a prior backup can be automatically
expired.
The TSM retention policy only applies when writing a new backup using the same backup job. When this
occurs, the policy may allow:
1. no backups to be expired, removed or overwritten without manual expiration .
2. automatic expiration of backups using the same job that are older than a certain number of days
3. expiration of a backup only if there are a minimum number of un-expired backups of the same job
remaining.