Or very strong password

Well, you might have only 1 main client, but if that hardware fails and need to connect from a temporary client or after a fresh install you’re out of your own server…

Regarding SSH Keys, I was wondering how you keep your key safe and potentially usable from another client?

Fixes IP for me, but I admit I don’t have a lot of services to access to like OP does

localhost

Why: for privacy/anonymity concerns

AFAIK, only Joplin offers sync with NextCloud.

On mobile, sync works well, even with 2FA. But my access model is simple: 1/ create and edit notes on Desktop app 2/ read notes on Desktop and Mobile apps.

This looks cool, but can’t beat Joplin. Accessing securely my notes on multiple devices I synced on my Nextcloud is priceless.