I wish I had that kind of storage space!
I think you should try to determine what is causing the freeze of your session.
- Is it some sort of inactivity timeout? If so, maybe you can disable the timeout, or set up a cron job that sends a keypress event to the session?
- Maybe you've got a periodic network outage issue, possibly caused by mispatched duplex/speed settings on one of the machines?
- Is the server you are transferring from a Windows box that likes to freak randomly during such a large transfer?
- Would it be viable to multihome each machine and create a direct connection between them, removing all outside influences like network switches, routers, etc.?
Just my limited thinking on this subject.