Electricity vs. energy. Electricity is only part of energy.
I hope it is going to be ok. Automattic has been involved with matrix before. Time will tell, but I’m more hopeful than afraid.
I tried to compare some backup solutions a while back: https://hedgedoc.ptman.name/kket4uo9RLiJRnOhkCzvWw#
Forget about docker. Run caddy or some similar webserver that is a single file next to the assets to serve.
How full is your ZFS? ZFS doesn’t handle disk filling and fragmentation well.
Quite far: