freeearth

It works on CalyxOS and FP5

IMO, don't buy an RPI. It's overpriced and missing SATA and PCIE, so you would need to use USB-SATA and it's not about moving big mount of data.

You might take a look at older Synology or build your own NAS and run TrueNAS on it

Pelican - static site generator is very simple

This. Hosting Baikal for calendar, contacts and tasks on RPi and DAVx5 + Fossify Calendar + Tasks on Android

150$, sorry

DivestOS is a good option

NC itself is discussable, but desktop/android clients are awesome. Autoupload and files preview without download are great features.

Just specaluting.. is it possible to mount NFS through systemd and make docker service dependent from that mount?

You could take a look here https://forums.serverbuilds.net/c/builds/18

I suggest LGA1151/1200 so it's more power efficient in idle

You can take a look at Aoostar R1, there is 2 bay option with Intel N100

Debian testing?

You can check ETA Prime on YT, there are tests of some small gaming PCs