Change TeddyCloud instance / restore Backup

Hello,

I had installed TeddyCloud as a container with Portainer in version 0.6.3 and then updated to 0.6.4.

I am now interested:
If I want to change the instance of TeddyCloud - e.g. when moving to new hardware or simply for a new installation because I have “tinkered around” too much - how can I “take along” the configuration?
Specifically, server certificate, box certificates, known tonies?
That way I wouldn’t have to reflash the boxes or put all the Tonies on them again…

In the first attempt I simply copied the tonies.json to the new instance - didn’t work. No tonies are displayed.

Hence the question:
Where is it stored which Tonieboxes exist and which Tonies are present?

Best regards and many thanks!
Stefan