What ya mean by backup? If the power goes off then so will both ya supplies. Not sure if thats what ya wanting, or if ya wanting something like a UPS, so if the power goes off then a battery source will take over.
No I mean could I set it up to combine my two supplies or something? What would happen if I plugged it into the wall then connected one of the cables from inside my comp to the 450? (with the rest of the stuff on the 550)
