I’m not sure I understand correctly, this is supposed to be accessible from the net? While the RESR API looks really neat lack of any ACL looks like a deal breaker.

It looks like db is fried, I’d assume all the permission errors prevent it from running normally. Is there a healthcheck configured?

I would assume they want to factor in startup time as well as IO handling overhead - raw disk IO should be the same given programs are run in the same environment.

Popular choices include peertube and MediaGoblin

It’s recommended to install YunoHost on fresh, dedicated systems. It’ll most likely not break anything but it’s best to have backup ready. It is possible to then expose docker containers, but I’d just recommend installing Nextcloud in ynh and transfer the contents over.