I have a real serious problem with my Exchange backup
Windows Server 2003 (SP1)
Exchange Server 2003 (SP2)
NetBackup 5.1 MP4

I separated my mailboxes backup "Microsoft Exchange Mailboxes:\[A-E]*" and
so on.
Each day, for the past 2 weeks, one of the task goes bezerk and takes an
infinity of data from the server, filling the tapes with useless data. The
server has only 36Gb of hard drive and the backup can go up to 200Gb...

The worst ting about that is that it is not always in the same task.
Some times it's [A-E]*, the next day it's [P-R]*...

The logs are useless for me.