The Backup Exec audit logs are deleted based on the time in UTC instead of local time zone during database maintenance.
For example, if local time zone is Japan Standard Time (JST) which is UTC+9:00 and the number of days to keep audit log data in the database is set to 2 days, the entries are treated as follows during the database maintenance on February 14, 2013 at 4:00 AM JST.
2/12/2013 11:56:11 PM ... Deleted as expected
2/13/2013 0:03:01 AM ... Deleted, though it should not be deleted
.......................................
2/13/2013 8:59:58 AM ... Deleted, though it should not be deleted
2/13/2013 9:00:30 AM ... Not deleted as expected
This issue is currently under investigation by Symantec Corporation. For more information please check the following article.
http://www.symantec.com/docs/TECH202816