NeoSound
Fractal Fanatic
HX Stomp, but I have never needed a backup for my Fractal gear in 4 years
Me too, and don't know how to use or hook it up it's been in the closet so long.
Ideal backup would be the same unit with the same presets/settings. Probably a good thing to do if you are making money with your equipment but there are several stomp box size gadgets you could get by with.