We've got a customer doing a similar thing.  For these "special" backups,
they are using a separate primary tape pool and taking that pool's tapes
off-site everyday.  If they have to do a restore, they will incur a transit
time penalty while the tape is being brought from the off-site.

Kelly J. Lipp
Storage Solutions Specialists, Inc.
PO Box 51313
Colorado Springs CO 80949
719-531-5926
www.storsol.com
lipp AT storsol DOT com