I'm going off to college this year, and all of my classes are online only. I'm still going to be living in a dorm, and with questionable power in the room, I want a battery backup that will last me a minute or two if I need to save a document or project if the power goes out. My PC draws about 450w under max load, so I need one that can handle more than that through the battery. What would be the best battery backup for me? I need one that has several plugs on it. On amazon the only one I'm seeing above 450w is 900w (linked), which seems like a way I could cut some of the price. Is there one around 600w with nearly as many plugs (8 minimum, 6 if it has two 5v USB ports) for less than that? I'm not opposed to spending that much if it's the best one for my needs but I'd want to know if there's a more suitable option before pulling the trigger. Thanks for the help.