http://xmr.nowherejezfoltodf4jiyl6r56jnzintap5vyjlia7fkirfsnfizflqd.onion/opsec/failovers/index.html
Then power on the homeserver, and after it booted, connect the serial to usb cable from the UPS to the homeserver, and you'll see it appear like so: [ Wonderland ] [ /dev/pts/3 ] [~]
→ lsusb
[...]
Bus 003 Device 003: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
[...] Then, let's install network ups tools (nut) and make it scan for any ups connected via UPS like ours: [ Wonderland ] [ /dev/pts/3 ] [~]
→ apt update -y ; apt install...