Yes, I just configured the DBbackup expire date(DRMDBBACKUPEXPIREDAYS) and yes, 
I have lots to read :)
 
Thanks

>>> 

From: Richard Sims <rbs AT BU DOT EDU>
To:<ADSM-L AT VM.MARIST DOT EDU>
Date: 1/9/2009 2:05 PM
Subject: Re: [ADSM-L] Scratch volumes - TAPE - DB
Before you do anything, review how you set up your DB backups.  If
they were through DRM, you should be employing DRM regimens to expire
them, rather than interfere with Delete Volhistory.  And your DB
backup retention needs to mesh with all server recovery elements,
particularly Reusedelay.  Keep recoverability objectives in mind as
you approach housekeeping.  Review that subject area in the Admin
Guide manual to assure that all needed aspects are covered.

    Richard Sims