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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
ectoplasmosis
Sudden power loss is a solved problem*. Cheap too.
For desktops it's as cheap as £50: https://www.scan.co.uk/shop/computer-hardware/ups/all
I have both my desktops and my NUC running off an ancient UPS. It wouldn't handle anything more than 20 minutes of power loss but that has pretty much never happened at my house in the last 15 years. But power blips under a few seconds in length are more common that you can imagine. A good UPS also ensures there is really clean power free of surges/buzz/etc.
Laptops shouldn't ever suffer because of the built in battery.
* OS crashes are a different kettle of badgers.
I'll be looking to upgrade to a 2U rackmountable UPS as I attempt to get all of my stuff into a nice 20U homelab rack.