More Backup Questions

[Gordon Chamberlin]

Well, I'm finally convinced that tape backup machines are evil.

I'm considering going without a tape backup and do IDE hard drives or
perhaps even writable DVDs.  (Do they make rewritable DVDs yet?)

I have to backup windows workstations.  There are about five of them.
I'm going to backup "My Documents" and Outlook email.  

I don't want to create shares on each workstation as they'd be visible
by all.  I know that I could reduce permissions to make the shares
readable by a single user/machine.  

I'd also like to only backup changed files, and encryption would be
nice.

Either client pushing to server or server pulling from client is fine. 
Right now, I think it would be easier to run something on the client
that pushes data to a server.

My question is:
Does anyone know of a program that does this: backup changed windows
files to a remote linux machine that I can execute at defined times?

I'm willing to run samba on the linux server.

I realize this may be off-topic as I am trying to do things on windows
machines.  Just wondering any of you have tried to solve a similar
problem.

Thanks.
-- 
  Gordon Chamberlin             Software Architect
  Visualize, Inc.               http://www.visualize.com
  (602) 861-0999 ext. 14        glac@visualize.com