An alternative could be Debian+Podman and Ansible. I used it for a while and it was quite good setup.
freeearth
You can use Keepass and share its file in any preferred way. No need to depend from external services
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
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?
Instead of Bitearden you can use Keepass and share db file with syncthing