Just ordered a UPS to take care of this very problem, and also run one of my two canisters in event of power outage. I did not realize they are so cheap to run, my Aqueon 200GPH canister says it draws .25A which means it's only 30 watts. You can run that for a few hours on the UPS in $150 range (not including if you are running lights and other things). It's an hour on a UPS in the $40-50 range. That's not a bad peace of mind, especially if you overstock. I'm going to plug the Fluval and one canister in this. My CO2 and airstone are on timers with battery backup built in, they lose power but don't lose time nor programming.
Fluval might have a programming/hardware interface, I didn't notice any ports. You can finagle the android app to run on a Pi or a computer, and then automate that using key/fingerstroke recorder scripts to go in and set time and programming on some interval, little bit klugey but it can work. Lotta trouble though when they can just put in a little watch battery thingy.