I'm looking to buy a UPS to guard myself against winter power outages in my hytte. I need it for one notebook and a router for a couple of hours (I will get extra time from the notebook double battery).
Ideally I would keep the UPS connected to my desktop PC to give myself a few minutes to make checkpoints and shutdown, and only then switch it to the notebook and router. However, I've read that this would require a pure sine wave output. This seems to leave me with heavy-weight noisy monsters. I hoped to be good with a small APC or another quality brand, but their smaller models produce an approximated wave...
I will be grateful for advice or sharing experience.