In Unix and Linux, you can use the scp command to copy files and directories securely between remote hosts. The scp command uses SSH to transfer data, which requires password (standard user account). It encrypts both the file and passwords exchanged.
Syntax:
scp local_filename remote_user@remote_host:/destination_path/destination_filename
SCP copies between two remote hosts are permitted as well.
scp user@remote_host1:/source_path/remote_filename user@remote_host2:/destination_path/destination_filename
For additionla options (i.e recursive copy, change default port , etc..) try
man scp
There is also a tool for windows:
http://winscp.net/download/
