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VolumeSnapshot and CSI snapshot

We have persistent volumes now — how do we back them up? VolumeSnapshot takes a point-in-time snapshot of a PVC's contents — and with EBS CSI, it creates a real EBS snapshot on AWS. This article closes Part IX: install the snapshot controller, snapshot a PVC, restore a new PVC from that snapshot — with a hard-won lesson on why the first restore came out an empty file, and why you must sync before snapshotting.