My BX750MI-GR has saved my precious data on two occasions. Earlier this year, my seven year old, well used waffle iron shorted, popping loudly and sparking quite brightly in the process, probably because of all the gunk that had accumulated inside its less cleanable interior over the years. That not only made my breaker trip, but also blew the 16 amp main fuse. The UPS kicked in immediately, making a klick and a beep, which felt amazing. That was my first time ever.
As for the second time, see this post.
I have a UPS that I use for my digital clock that runs off of the plug. If it turns off with a power outage the clock it remembers get desynced. Yep, it does not have an externally powered RTC. After plugging it to the UPS I never have to set it again if the clock turns off after an outage.
Is it overkill? Yes. But I go by the idea “any tech I buy MUST keep working until it dies in an unrepairable way”, and that clock is going strong for like 15 years.
That’s just respecting your hardware. Which I in turn respect.