I've run OpenBSD continuously at home without backup power for something like eight years. They probably loose power about once or twice a quarter. I have yet to detect lost data that was important. Measures are taken. If a storm is coming through, I'll shutdown till it passes.

I've been lucky with release driver support. The little Lenovo ThinkCentre's being used seem to chug along without crashing on driver issues, at least with OpenBSD releases.

The standard OpenBSD partitioning scheme is also being used. Boot time fsck has never failed when the storage was properly attached and in a good state. Backups are performed using pax. So far, so good.