Freezer

Backups belonging to a policy eventually get deleted. Every policy has its number of generations, and the retention management process automatically deletes older backups. If you wish to keep a backup indefinitely and make sure it is not deleted, move it to the freezer. For example you can once you’ve setup a server and its applications, you could take a first backup session and freeze it, in this way whenever needed your recover the original server the way it was before being used like for testing purpose.