Take control of a (set of) block device(s) at installation time and use a snapshot-based backup / restore strategy (SB-1127)
Backup / Restore
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Rsync based backup is really slow. Snapshot based backups should provide greater backup & restore speed. For example you connect to an older version of the database by starting postgresql with pgctl -D <snap> Use a technology with writable snapshots for that (eg. zfs for linux which is available on ubuntu xenial). Rely on zfs send & stuff like that to ship the backup increments to a NAS.