When you create the exclude statement in the options file, the excluded
files will be deleted, so you don't need to do anything special to get rid
of the data.  It will be gone the next time an incremental backup is run.

Your second question.  I would create a disk storage pool and make the
existing tape pool the next storage pool for this disk pool.  Then set up a
schedule to migrate data from the disk pool to the tape pool once per day.
 I'm assuming you want to have your data safely on tape as well as on disk.
 By doing this, you will always have the most recent data in the disk
storage pool and the previous day's backups will be on tape.

Kelly J. Lipp
Storage Solutions Specialists, Inc.
www.storsol.com
lipp AT storsol DOT com
(719)531-5926