Synthetic FULL backups to disk will take on a 1 Year disk retention and expiration after the backup is performed. The job maybe setup to key the backup or "Keep for" 2 days. In the Backup Set information the media display a expiration of exactly one year in the future (Figure 1).
This issue can cause a low disk condition as the media will not expire the disk media as expected.
A hotfix is now available for this issue in the current version(s) of the product(s) mentioned in this article. Refer to the Hotfix link under Related Documents at the end of this article to obtain the hotfix needed to resolve the issue.
Backup Exec 2012 Rev 1798 Service Pack 2 (TECH203155)
Backup Exec 2012