Transferring content to Jamroom
Installation and Configuration
There's nothing off the shelf to do it, so a custom module would be required.
Is it just data or media files as well?
It would be a big job, and with media files, even bigger.
The reason I ask is that I've recently wanted to transfer one JR5 site to another so have started a 'MergeSite' module. Very early days and it still might not come to anything, so don't get excited, but interested if it could be made more 'general purpose' for situations like yours.