Previously, all container volumes initialized via the `container-volume`
service would have local rotating backups performed by pushing `tar`
archives to the `/var/lib/backups/coreos-home-server` directory.
This proved to be a simple and effective mechanism for storing historic
volume state locally; however, the use-case for historic backup is
usually data loss, either partial (e.g. by deleting files inadvertently)
or complete (e.g. by loss of disk), which is likely better mitigated by
more concrete mechanisms of retention.
In addition, this need to store historic volume state locally, in its
totality, proved to be a barrier for performing partial backups, which
is an issue especially for larger volumes.
This commit deprecates this simple, generic volume backup/restore
mechanism, and instead has us rely directly on Rclone reading from the
volume in question.
Alex Palaistras
fe30677a46