Well my thought to this has a few folds.
Firstly - If we don’t have a fog server that is functional I can deploy to new hardware from another machine.
Secondly - This backup fog server could be used to create regular “Server backups” so that I have a fail-safe to our existing DRP.
Third - It gives us a piece of mind that if we screw up our production environment that all we’d have to do is reimage our current server and be back up and working, and able to image any of our devices with minimal interruption.