By default, the dump command will use the rsh command and
protocol to backup to other servers. However, this field can be used to select
a different command such as ssh, which is more secure and more
commonly used. SSH will only work if the root user's SSH configuration
allows passwordless logins from this system to the remote server.
On Linux and BSD systems, you can also select the FTP option, which will
use Webmin's built-in FTP client program to transfer the backup to or from
the remote server.