PPR-Context Backup

Hello Community, since few years we are upgrading from 2015X (no cloud version) to 2022x cloud version.

Is it possible to save the PPR context as a backup, or at least export it all at once as 3dxml?
Are the PPR backed up somewhere in a specific location?

I need to save the data from the 2015x (no cloud version).
The licenses expire soon and so the data is also gone.

I would be glad if someone would help me


thank you