Scheduled folder synchronization with bandwidth throttling

I have two facilities with a Windows 2000 Server at each plant.  The plants are connected together via a 54Mbps wireless connection.  During the weekday evenings and on the weekends I want to syncronize the contents of each server's external hard drive backup to the opposite plant.  The files I need to syncronize are all large multi-gigabyte files.  I need a recommendation for a free or paid-for program or solution that can:

1.  Run on a scheduled basis
2.  Synchronize two folders and their subfolders/files
3.  Pause in the middle of file transfers (in case the connection is interupted) and resume
4.  Can skip over files that are open, locked, or corrupt (and record the skipped file(s) in a log)
5.  Throttle file transfer bandwidth

Programs like Karen Replicator (http://www.karenware.com/powertools/ptreplicator.asp) and Cobian Backup (http://www.educ.umu.se/~cobian/cobianbackup.htm) can do points 1 and 2 very well.  NSCopy (http://www.nullsoft.com/free/nscopy/) can do 2 and 5.  And finally Total Copy (http://www.ranvik.net/totalcopy) does a great job with 2, 3, 4, and 5.

Is there another program out there that has all 5 features?  Is there a way to get Total Copy to run as a scheduled task?  It does not have the ability to save scripts and there is no interface to configure.  Is there any other way to do this correctly?  I would rather NOT use FTP programs to do this particular job, if possible.