If you are using Private Exchange, we must have helped you to connect your version control system with Playground in the beginning.
If your circumstances changed or you think Playground is not the right tool for you, you don't need to worry. All your code is already there in your version control in the intact state. The only thing that you don't have is the data that the platform created to support all processes like users, plays & activities. Please contact the Playground team if you wish to have an export of these.