I have it like this, everything is saved - even the radio, DAB station, display colour and sound settings.

I don't disconnect the battery on my classic car. I drive it once a week. I never have to reconnect anything. Everything works great. I would buy the radio again immediately and can only recommend it!

I had to do this after the winter break. Generally, the smartphone does not automatically connect to the radio when you get in. You have to press connect manually on the smartphone. No idea what the problem is.
Otherwise price/performance quite good, but there are def. also better... for money of course also☺️