Documented in the NetWorker 7.5 release notes, and a topic of much discussion at the moment on the NetWorker mailing list is the topic of browse/retention times in NetWorker 7.5.
The change that has occurred is that browse and retention times are now always set to 23:59:59 on the day of expiry.
So, in 7.4.x and below, if you a backup completed at 09:00 on Monday, and the browse/retention time was set for 1 day, the backup would expire at 09:00 Tuesday.
Under 7.5.x however, that same backup will instead expire on Tuesday at 23:59:59.
While this may be an unexpected behaviour for a lot of sites (assuming the release notes haven’t been read…) for the most part it shouldn’t cause too much of an issue in an environment with adequately resourced media. However, if you’re suddenly finding now that you’ve upgraded to 7.5 that some backups aren’t being released quite when you expect, this may be an alternate explanation to standard dependency checking issues…