I live in So. Cal. (Riverside/Perris) and we have been having frequent power outages (6 or more per day). None, however, have lasted longer than an hour. I regularly turn all my pumps off for 20-30 min when I'm feeding with no problems, so I doubt the short power outages that we have here are a big prob. Due to the frequent outages and the fact that we can't always be home when they happen, I think that ensuring your system (pumps, sump, timers, etc.) starts functioning normally as soon as the power comes back on is a more important priority than a battery back up. Another important consideration if you're not home during the day is ensuring that your ac unit will come back if you're not home to turn it on. Some home cooling systems reset during a power outage and have to be manually turned on, which can turn even a short power outage into disaster if no one is home to turn it back on. We switched out our house thermostat and put it on a battery back up so that it resumes its previous settings as soon as the power comes back on.