OpenEBS and K8up: choose where data lives, then back it up

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OpenEBS and K8up architecture: a stateful application claims a volume through CSI and a StorageClass, which binds it to either the node-local Local PV engine on one disk or the Replicated PV engine, which writes to replicas on several nodes; the K8up operator creates a restic job that mounts the persistent volume claim and copies it to S3-compatible object storage.