[CentOS] Dump on remote filesystems?

I have a couple C5 systems I want to back up.  My plan is to, one way or 
another, back them up to a C5 machine in my office.  I have samba 
installed on the systems to back up, the machines are mounted on the 
system in my office, and a tape library hanging of the system in my 
office.

I was hoping to perform a simple /sbin/dump of the remote systems.  I put 
together a script for another successful backup I have going on a system 
with local filesystems.  But for remote filesystems, I get errors of File 
Cannot Be Accessed (//remote_system/subdir) which does exist as an smb 
mounted filesystem.

I'd use NFS, but I would like a bit more control and some level of 
encryption for the user authentication and data being transferred.

If a direct dump of remote smb filesystems isn't possible, I may opt to 
have each system perform their own local dumps, then run a script locally 
on the tape-connected machine to dump those local dumps, or copy the dumps 
locally then dump them to tape.

If nothing else works, I can always install Windows XP and use Windows 
backup program, but I'd really like to try and get this going under Linux 
before going that route.

Thanks for insights.

Scott