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.