FYI - To all of you who don't receive the Symantec Technical Advisory mails.
http://entsupport.symantec.com/docs/287287
Description:
A rare data loss condition exists for HP-UX, AIX and SGI media servers running NetBackup 4.5, 5.0, 5.1, and 6.0 where the last valid backup image on tape is overwritten by an empty backup header due to a failed backup job.
Regards
Nicolai