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I was under the impression it could do that, I think I build a snapshotting mechanism using this.

rsync does not have the ability to copy a file using the filesystem's copy-on-write feature. This is unlike cp, which has the --reflink flag. Here's the bug report on GitHub which the developers closed as "won't fix for now":

https://github.com/RsyncProject/rsync/issues/119#issuecommen...

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