About half a year ago I bought a used UPS. It didn’t have enough output to power my main PC, but it’s perfect for my home server and network.
Starting on Christmas eve and continuing even today, my neighbourhood has been getting intermittent brownouts. It’s only affecting one phase (house is on a three-phase 240V connection), which happens to be the one powering my network (also all of the light fixtures, stupid Soviet house), and the UPS works beautifully. I didn’t lose any of my services even once. Without it, I would probably be reinstalling Proxmox and praying to the RAID gods to restore my hard drives.
“It pays for itself as soon as it is needed” is proven true once again.
Nice. 15 years ago I lost half a days work (self employed) when power blipped. Bought a UPS that week. The power losses have been infrequent, but brown out and over volting have happened quite a lot. It is cheap insurance against disaster.
Last power loss was a loud bang and a flash outside during a rainy day, then UPS kicking in. A crow landed on an electrical transformer and got vaporized.