Thanks!  Right after sending that message I stumbled on smbtar and I
am going to try using that.  I am not sure how the archive bit works,
but thought I'd start the incremental process by using the -N option
with a logfile.  

For those who are interested, I did find a small bug with smbtar ---
it doesn't accept the workgroup option to smbclient, which people may
want.  I made a quick patch, and would be happy to send the patched
script to anyone who wants it.

Cheers,
R