Depending on your server setup there will be a fight for tapes. Turning
collocation ON for your onsite pools would greatly increase the time to
create backup sets. I have 4 backup sets running every 2nd day at once
(I have 10 drives which leaves 2 drive available to do restores.) I have
also noticed that you are unable to perform storage pool backups during
the creation of backup sets (it keeps canceling the process).

Joe Cascanette
The Cumis Group Limited

PS - each backup set will use its own tape(s), I have a PRM (and others
do as well) to correct this problem.