Barb, I've got two battery backup gizmos on my system ,I've got the mp40 battery backup that they sell separately and is rather pricey and basically a computer backup battery also that I've got a couple of powerheads attached to,....once power goes out they go on but at a slower reduced pace,... all it's basically doing is keeping some flow going thru the tank for a few hours until power returns,...I've had to use them a couple of times in the past and I'm glad I had'em. I'm not too sure what you'll need but maybe that'll give you a idea or two.
They're not going to replace a generator and keep all you equipment running like nothing ever happened but it's better than nothing that's for sure.