I'd like to set up my machine to SUP NetBSD-current, but I've never
done it before.  I can ftp the NetBSD-current tarballs from work over
a T-1 line, tar them to a tape, and load it on my machine at home, but
I only have a 28.8K modem connection for it.  How would I go about
setting up the SUP so that I don't re-SUP all the files that I've
grabbed via the tarballs?  Thanks.