Server to Server transfer

Look for a client that supports "FXP". If supported by the server, this allows FTP-to-FTP connections without passing through the client.

ssh from one server to the other and use scp

on windows you can use putty to connect to the server you want to copy from like so: http://www.jfitz.com/tips/putty_config.html

then typing:

ssh username@host_ip_to_be_copied_to
#enter password when prompted
scp username@host_ip_to_be_copied_from:path_to_be_copied_from
#enter password when prompted
#wait until complete

done