probably because they already own it.

use some file system with snapshots and differential backups, like ZFS, and snapshot it daily. Stream the diffs somewhere they can’t login to and which doesn’t mount the FS.

This will invariably save their bacon at some point.

be aware that most fridges have a defrost heater that runs perhaps daily to melt the ice off of the coils in the freezer. You’ll need to measure the power consumption with this heater on to know the peak power draw.

under 200 W sounds correct for the compressor