To make better use of my NUC I want to switch from the official HA supervised version to HA container. I was wondering what is the best strategy to do this migration. Is it possible to do a (partial) backup and then restore this in the HA Container version? Or do I need to start from scratch and will it only be possible to restore the yaml-files with configuration and maybe the dashboards?
The backup contains the HA config folder. You can extract that somewhere sensible and then point HA container at it. That won’t work for other software (the add-ons) though.
I’d suggest you start with a structure like:
/docker
/docker/homeassistant
Then you can create your docker-compose.yml file in /docker, and map the config folder to /docker/homeassistant. This makes it trivial to back up your Docker config and HA. By using the same approach for other software you can simply back up /docker and get everything.