yeah there are, even if you have a look through amibench there are a few progs that'll run tape drives. or coverdisk stuff like quarterback or amiback tools.
best tape backup software i ever used on the miggy was diavolo. could do file backups, or complete drive images. usefull if you used something like movieshop with a vlab motion or producer on the digital broadcaster *sigh*. or if you want fast backup and you know that your partition sizes are going to stay the same (better backup that RDB too)