About 15 years ago, a friend gave me an extra UPS he had. I hooked it up and had my computer plugged into it for several years. Not once during that time was it utilized other than when I tested it to make sure it worked. Eventually the battery died and I moved it off to the side thinking I would get a new battery for it. I never did and eventually sent the UPS to recycling. IMO, a UPS isn't needed in a home computing environment.
In my 40+ years of owning home computers, I've never had any piece of equipment fail due to power surges, brownouts, power outages and the like. YMMV.