I live in Southern California and this summer we have been plagued with blackouts during our recent record heat snaps.
I have a standard UPS unit (APC 650) and I have my canister and my HOB
filter plugged in. During one of our extended power outages (6 hours) it ran the pumps fine; the battery was nearly kaput when the power did come on, but it did the trick.
The cost of the unit was under $100 US.
It wouldn't work for extended outages (days), but it was better than nothing.