Server Private key backup Recovery file creation

I am looking at migrating SEPM 12.1.RU2 to a new server. Can anyone please advise how I create Server Private Key Backup Recovery File?

I have created a backup of the database from the Symantec Database Back Up and Restore tool but I do not belive this is the correct file as it was not located in S:\Program Files\Symantec\Symantec Endpoint Protection Manager\Server Private Key Backup folder.