Config backup/magic...
I installed HB on a windows machine. I also installed and configured the Shelly and Nest plugin. Everything was working fine. 

I decided to upgrade my hardware. I did not backup anything. I disconnected my old machine, and installed HB on a fresh Windows installation on a new pc.

I was surprised that all my settings were still configured. Even my Nest / Google tokens... How is this possible? Is this somehow backupped in the cloud or at my home installation?

I am working as IT and Security Specialist, and this magic worries me.... Please explain this or tell me I am getting crazy.