I'm in Switzerland and hadn't ever experienced a power outage in the 13 years I had been here but when Russia invaded Ukraine there was talk of intermittent rolling blackouts. They never happened but just in case I bought an ups for my home Ubuntu server and to my great surprise we had a blackout! There was a problem with a high-voltage power line coming from the mountains to my part of Zurich.

I happened to be in the cellar where I keep my server when it happened. The lights went out and I was in complete darkness other than the lights on the server and drives. I got my phone flashlight working and looked at the screen on the ups. It was working perfectly - the server was running and the amount of minutes remaining was dropping until there was five minutes left and my server initiated shutdown. Later that day when the power came back on the server booted back up.

So I'm a prepper too.