I used the good old "tar" command. It is available on Aminet somewhere. "tar" is a command-line archiver. I seem to remember it needed some other device installed to work - a tape handler in L:? I think this was available on Aminet as well.
This is how I used my A3070 tape backup from 3.1 and it worked fine - 250MB.
The nice thing about tar files is that they are (in theory) portable.
Cheers!
