Configuration Files are generated from the client and are in a proprietary format. The purpose is to assist admins who already have desired Settings and File Backup / Restore Plans defined in a client and would like to use those to create a new Configuration.
To use this feature, go to Tools - Export on the client toolbar and click Export Configuration. Deselect Image-Based backups and restores as well as Consistency Checks from the selected items and Export. If you deselect all items, only the Settings are exported (right-click list for shortcuts). You can then use that file to Import into the MBS console to create a new Configuration.
What I would have liked is for a plain-text configuration file that I could pass to the Configuration & Rules API (the API for which I have a feature request ;) ).
As you probably guessed from my comments in the last few days, I'm trying to automate management of the service as much as possible.