I was very surprised at how easy it is to backup up your media wiki appliance. Log into your mediawiki appliance, go to the Back Up and Restore and then go to Backup Settings. Enable your backups. For backup location I choose to use a ‘Windows’ File System Share.
Then for connection host use your server, and then for your connection path you need to use forward slash notation.
For more detailed instructions and screenshots go here –> http://mellerbeck.blogspot.com/2009/07/backing-up-your-mediawiki-appliance-is.html