I am looking for a small UPS for UFB which will fit into a wall mounted Cabinet.

The problem is I have multiple devices in it 2*12V (Mikrotik Router + ONT) + 6V Voice SPA112 (unless I can run it on 12V?)

Does anyone know of something which will do?

There is a http://www.mini-box.com/picoUPS-100-12V-DC-micro-UPS-system-battery-backup-system

and http://www.mini-box.com/OpenUPS

but the presume the Batteries are the biggest part..

I think I would only need an hour at most. Any Ideas?

Or is there a small 240V in/out so I don't have to run everything on 12V?