How about backing up the db to a device class of type file?  You could then
burn the files onto CDs or just make sure the files are kept away from the
server, perhaps at another site or at least on another system?  You could
even use NT backup to put the files on your 4mm tape.

100 GB tape for 600 MB is a bit of a waste.

BTW, you don't back up the log files, just the db.

define devclass file devtype=file directory=c:\tsmfiles\ maxsize=50M (check
the syntax on this)
backup db type=full devclass=file

Kelly J. Lipp
Storage Solutions Specialists, Inc.
PO Box 51313
Colorado Springs, CO 80949
lipp AT storsol DOT com or kelly.lipp AT storserver DOT com
www.storsol.com or www.storserver.com
(719)531-5926
Fax: (240)539-7175