Honestly with modern filesystems I haven’t seen a need for a UPS. I’ve had unexpected power outages on my PCs more times than one might think (something something old house, animals and kids) and the most I’ve had was some ZFS errors in a temporary VM for some temp files that corrupted. Maybe I should get one for my home server, but its already entirely built on a shoestring budget so a UPS would cost more than the entire system