For a relatively short power outage, I have 2 Vortech powerheads on Ecotech battery backup. Supposedly it should last 24h or more.
I enabled the heartbeat (or whatever it's called) fearure on my Apex. My cable modem and router are connected to a UPS. If the power goes out, my phone gets a notification from the app and text message. I also have security cameras connected to UPS so I can see the tank remotely to verify power is on or off. This allows for enough time to call for help if I'm away on vacation so someone can take care of the tank.
I also have a gas generator that can power the entire tank, and it only requires moving two power cables from the wall outlet to generator to make the switch over, easy in case I have to talk someone thru doing it for me over the phone.