title: Backing up data volume containers off machine
body: <p>when reading this:</p>
  
  <p><a href="https://docs.docker.com/userguide/dockervolumes/#backup-restore-or-migrate-data-volumes" rel="nofollow">https://docs.docker.com/userguide/dockervolumes/#backup-restore-or-migrate-data-volumes</a></p>
  
  <p>Am I correct in the thinking that tar file they're referencing is still isolated in containers, and these examples aren't demonstrating anyway to preserve state after a machine loss?</p>
  
  <p>Or is there a mental leap I'm not making with due to my ignorance?</p>