I don't use CM, just tried it once. However I noticed all your project docs were locally stored under:
C:\ProgramData\Altium\CircuitMaker {some guid}\...
So you don't actually have to wait until it's released to take a copy of the PCB and sch files.
The problem for me (even for OS designs) was having to commit footprints and sch symbols to open cloud before verifying that they were correct.