Eh, my gen8 is chugging happily along with Nextcloud, Synapse, Jellyfin and friends, docker-mailserver, a GoToSocial instance, Home Assistant in a VM, and so on. I don’t know what else is running on your server (and, admittedly, I’ve added some RAM and stuck in a somewhat beefier Xeon CPU), but it should have no problems running a web app like Nextcloud, especially if you stay away from the more intensive stuff like office apps.

That aside, I’ve gone through a fair amount of note taking apps, and so far I like Joplin best, too bad it doesn’t seem to work out for you. Not sure when you last checked out the Android app, but I do know there’s been some changes in the editor it uses recently-ish, it might be worth it to check again.

I’ve used Rockstor in the past, I liked it mostly (but in the end went with a self-configured OpenSUSE system).

Apart from that, I hear good things about OMV and TrueNAS

Fun stuff, although I wonder how weather proof this would be — my door bell is outside, with nothing in terms of shielding from the elements.

I also liked the pi-as-a-travel-router, that gave me a solid idea!

Tell your friend that Lidarr can connect to Spotify to get your followed artists, playlists and saved albums.

NAT is not a security feature.