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for data I rely on my filesystem. Both ZFS and BRTFS support atomic snapshots which need no additional storage space (i.e. copy-on-write), and you can sync those to wherever you need using rsync or whatever. As long as you sync the snapshot you are guaranteed to have a consistent state. You can however also efficiently sync the snapshots themselves to other volumes of the same type. There is e.g. buttersink (https://github.com/AmesCornish/buttersink) which allows you to incrementally sync snapshots over the network, as long as both source and target are a btrfs volume. For restore copy the most recent snapshot back to the new drive and off you go.