Again, I think Offline Folders will do what you want, but using a different port is not going to make anything faster, unless you reserve bandwidth for that port.
If what you have on each computer is in the same location on the drive, then you could also use ntbackup's command line options, or a utility like robocopy from the Windows 2000 Resource Kit.
But you have asked for a manageable process, which if you're not going to do Offline Folders or some kind of backup/syncing with ntbackup or robocopy, then you're going to have to spend money on something like Veritas Netbackup.