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I want to do a Linux->Linux backup from server A to server B.

Users of server A often move multi-GB files and directories around, without changing them.

Will rsync (-avr --delete) spot that the destination already contains the multi-GB file in a different directory, and so avoid the network traffic?

If not, would using ZFS on servers A and B, and syncing with zfs send do the job?

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Yes, zfs send can incrementally send differences between snapshots. Moving a file would manifest as a payload of a few bytes when doing an incremental zfs send between pre-existing snapshots on both sides.

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