Our outages are in the less than 12 hours range
I use 1 Jebao SW-4 on the lowest setting and backed up by an Aquarium Battery Extender V2, which turns on automatically when power interrupted and will run this pump for the “gas exchange process” for about 3 days.
Generators are great for long term applications, but self starting ones are very very expensive, otherwise you have to start it when power goes out.
It kinda depends on what type and frequency of the interruption.
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Last year there was a 3 day outage, I didn’t have my saltwater tank luckily, and all my freshwater fish did fine, around were I am we get quite a lot of outages in the winter