kind of… a “AMD GX-420GI SOC: quad-core APU” the one with no L3 Cache, in an Thin Client and 8Gb Ram. old Laptop ssd for Storage (128GB) Nextcloud is usable but not fast.

edit: the Best thing: its 100% Fanless

Have an fan pushing out on the ceiling in the middle of the house would work good, it will get the hottest air out. But also keep in mind: the air has to come from somewhere, if the house is sealed (new windows) this will not work well.

If you need more ram but not a lot of CPU a used thin client can work, i use a HP t630 since 6 months now with only nextcloud and storage, has 2 ddr4 slots and 2sata m.2(not Nvme) for Expansion. Again its a 4core Pre Ryzen AMD chip so don’t expect any Wonders. https://www.parkytowers.me.uk/thin/hp/t630/ this is a good side for this and other thin Clients.

Edit: according to HP the idle Power consumption is ~12w

I had them once named after things ( mostly Ships) from Jules Verne Books: Nautilus, Albatross, Formentera, Duncan, Dobryna, Hansa.

Can you reach the dockercontainer? i have used docker only once (without any Proxy settings )but i had to specify which ports from inside go to which on the outside, something like: “docker run --name docker-nginx -p 80:80 nginx” https://www.digitalocean.com/community/tutorials/how-to-run-nginx-in-a-docker-container-on-ubuntu-22-04

You don’t need a Own Domain, you can use a dynamic-dns-service to reach your server from everywhere, even if your ISP changes your ip. I use dedyn.io. (its free) here is a turtorial: https://desec.readthedocs.io/en/latest/dyndns/configure.html

Have you Seen the TV-Movies from 2009? They are also good.