Even very small backups, which usually look like powerstrips, can run a computer for about 15-30 minutes. Computers use MUCH more wattage than a simple flexwatt, but without knowing the exact numbers on each I give give a definite amount of time.

You can get a 6 hour battery back up for around $300, which could translate into days of power, obvious depending on how many things are running off of it. $300 might be a good investment if you are hatching $10,000 dollars in snakes.

Tim mentioned something about proportional thermostats don't work with generator power. I'm not sure if it has the same affect with the back ups.