If for some reason you don’t like the look of NUT, and you get an APC UPS (and maybe some others?), there is always apcupsd. It will run shell scripts upon certain events, etc. Old, simple, works.

N100 ain’t it.

Maybe i3-N305… or a mini PC with AMD H-series chip (or similar) configured TDP-down if you are concerned about power usage or fan noise.

Very easy to find good deals (and parts) on these 1L business PCs!

Testing an image post from Voyager client…

I only own the gear marked A and B, which lives above the couch I call home.

A is my web services 24/7 Proxmox box, an Intel 8500T; 2 routers; an 8TB HDD; and a Back-UPS Pro so old its ethernet surge protection is rated for 100bT, with a brand new LFP battery in it. The UPS powers both A and B.

B is my personal Proxmox box, an AMD 5750GE, which I use for development and running desktop OSes which I remote into, plus a GL.iNet Slate AX router. These come with me if I stay someplace other than the couch (not pictured). That’s why they’re on different shelves. Also, there’s a USB wifi dongle w/antenna connected to B which I used when some stupid website demands I drop my VPN (all traffic from everything pictured is routed thru 24/7 private VPN endpoints, aka a $2/mo VPS or three).