You should be able to do this quickly with a backup/restore and then editing the repo.properties file as outlined here: http://support.confio.com/kb/article/moving-sql-server-data-warehouse-repositories/1532/
For your case, I'd suggest the following:
1. Shutdown your current instance of DPA
2. Backup and restore the DPA repo to your new server
3. Install the new version of DPA
4. When install is complete, but before you open DPA in a browser, stop the DPA service
5. Edit the repo.properties file to point to the new server (don't forget you need to recreate logins and access on the new server)
6. Restart DPA
7. Open DPA in a browser, and you should see all your registered servers
Let me know if that works for you.