Just treat them like two separate hosts on a network. I use scp.
scp -c arcfour sourcefile.bin host:/srv/xen/destinationfile.bin
Replace sourcefile.bin with the file you want to copy
Replace host with the remote host ip address
Replace destinationfile.bin with the destination path
I use -c arcfour because it's the lightest encryption. It's worth about another 10-20 MB/sec
Grant McWilliams
http://grantmcwilliams.com/