@Essence of Flowers - The OpenUPS is a 12v battery only, with proper charging and discharge controls. You'll need a 12-24V charger for input to it, and the PicoPSU to power the board via ATX and PCIe power as much as it's capable (within the ~5A limit).
Might be less than ideal for the full gaming system, but with a low enough power use, it could certainly do the trick.
The original OpenUPS (also at the above link) does ~6A with a 10A peak.
OpenUPS2
The OPENUPS2 was designed to provide user specified regulated power output from a wide input voltage or battery backup
www.mini-box.com
Might be less than ideal for the full gaming system, but with a low enough power use, it could certainly do the trick.
The original OpenUPS (also at the above link) does ~6A with a 10A peak.