Your math is wrong. If the Celeron runs 65W at idle then it is consuming at minimum 1.56kWh a day, at a price of €0.20 per kWh you’re looking at a minimum operating cost of €113.88 a year.

You didn’t factor in that days have 24 hours, not one hour.

With the way federation currently works, it’s impossible, sorry. It’s one of the pitfalls of a decentralized system without consolidated ownership: any of the nodes could fail at any time and the responsibility of bringing it back up is the sole job of that node owner.

You mean fuck cars, fuck capitalism, look how cool Lemmy is?