Windows "client", and already-compressed files

Forgive if these have been discussed before. I didn't find much about
Windows in the mailing list archives except my own posts a year or so
ago ;-) Anyway, I love hdup. And the cheaper hard disks & DVD-R's
become, the more relevant it is. I will never use a tape again and
never worry again!!

Right now, I use hdup to back up two Linux servers, and my two Windows
workstations via Samba. Samba works OK, but isn't ideal. I'd love a
way to "run" hdup on the Windows machine as a scheduled task so the
Windows machine can initiate the connection via SSH or SSH tunnel &
SMB.

This would make it possible to provide a "backup" service to my
friends/clients on my little ISP network, so they could back up their
machines remotely to my server. It's not feasible to do it the same
way outside my network, because that would require either a major
security hole on their machine, a static IP, or very complicated SSH
server and/or tunneling configuration which might be possible but is
too difficult to implement practically.

I'm not skilled enough in C software develement on Windows platform to
take this on, so I wonder if anyone's been able to port HDUP to
Windows before and make it work with SSH to back up a Windows box to a
remote server.

2nd - a much easier question. I've switched to bz2 for compression
lately to save space. It's a lot slower than gzip. My poor Athlon 950
backup server takes several hours to do a full backup (~7 gig
uncompressed) of my windows workstation.

Does HDUP try to compress files that are already compressed, or not
really compressible, e.g. .zip, .gz, .jpeg, .mp3, .wav? Is there any
way to configure this? An option like "exclude", except "called
"no-compress" or something that would let you specify pattens to NOT
compress, would be very handy for speeding things up. Since I make ZIP
archives of things that I use less often anyway, there's no reason for
HDUP to waste time trying to recompress it.