It's probably 20 years ago now when I started investing in UPSes for "critical" stuff in the house. Admittedly at the time our village was fed by overhead power cables so we got regular outages, and I was doing stuff from home that meant I had some small servers running for my business from there. So UPSes to keep the computing stuff, and the ISDN and ADSL routers alive.
Nowadays it's a bit easier because most of our computing is done on laptops, so they don't care about short-ish blips. I still have UPSes running my home server, all the networking kit, the DECT phones, and the entertainment stuff in the living room. That means a short blip won't turn off the TV, lose any programmes that are being recorded at that moment, or drop the amp out. That stuff won't run very long (20 minutes or so), but it gives time to ride out short outages or do an orderly shutdown to allow critical stuff to run much longer. I can manage several hours of no incoming mains without losing the ability to talk rubbish on the internet.