Move Hetzner, move!
Well, I am using Hetzner with a couple of servers and there is nothing better than ISPConfig (I am running ISPConfig 2 and 3 on several servers). I have used many other solutions but ISPConfig is the only one which really makes me happy. Slim, efficient and suited to my demands (my requirements are quite high in a few areas, ISPConfig does it all).
As far as backup is concerned (I understand Hetzner was asking for such a feature) - I am using Tartarus with the Hetzner backup space (a solution they recommend) and I'm very happy with this too.
So, people at Hetzner, go for ISPConfig, you'll do yourself a favour.