Problem Statement
Describe how you would backup data from a Docker volume and restore it to another host.
Explanation
One way is to mount the volume into a temporary container, use `docker run --rm -v volume_name:/backup ubuntu tar czf /backup/data.tar /mountpoint` to archive the data, copy the archive to the other host (scp/s3), then on the destination create a volume and restore with `tar xzf data.tar -C /mountpoint`. You could also use `docker cp` or storage driver snapshotting. Having a repeatable strategy for data migration helps avoid loss of data in production.
