Webmin File System Backup using wrong port

[michael-lentz]

WebMin File System Backup to a remote server uses Port 22.
My target server does not use port 22.
How do I tell WebMin to use a different port when RSH or SSH to the remote server ?

[TheFu]

Any tool using ssh should honor the settings in the ~/.ssh/config file.

host remote-system-alias1 spirulina
  user thefu
   hostname www.example.com
   port 30122

Simple?
BTW I've never used webmin.