I was just looking into making a Deduplication tool for macOS / APFS. One common scenario would be to deduplicate macOS systems on separate volumes. Like, for us developers who have several macOS versions on their computers for software testing purposes.
I thought I could save a lot of space by having files inside /System and /Library share the same space by relying on APFS's cloning feature. However, when I tested copying a file from one volume to another volume, both being in the same APFS container (partition), Finder would still copy the data instead of doing the clone thing. Now I wonder if that's just a shortcoming of the Finder or a problem with the macOS API. After all, since APFS shares a single catalog between all volumes of its container, cloning should be possible across volumes, shouldn't it? -- Thomas Tempelmann, http://apps.tempel.org/ Follow me on Twitter: https://twitter.com/tempelorg Read my programming blog: http://blog.tempel.org/
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