Which is why me and people like me don’t care much what our relatives use :D

I think the majority of us also don’t want to play tech support.

Power cost depends. I use a thin client (J4105 CPU), and it idles at 4W. Idling is what it does 95% of the day. That power usage is lower than my modem, and a drop on the bucket compared to my (relatively low power) desktop PC. And I say that as a German who pays a disgusting 0.4€ per kWh.

Before I stopped fediverse, I was hosting lemmy on the cheapest hetzner ARM instance, with backups it was like 6€, so probably slightly below $7. Nextcloud has an ARM version so that would work.

Of course, only 40gb storage. I run nextcloud on an Intel VPS, it’s one of the few SSD + HDD offerings I’ve ever seen, and I got it on sale, so it’s less than 5€ paid yearly for 40GB + 500GB.

Edit: autocorrect