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I don't understand why a simple, closed source de-dup app is at the top of the front page with 160+ comments? What is so interesting about it? I read the blog and the comments here and I still don't get it.

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I assume it’s because it’s from John Siracusa, a long-time Mac enthusiast, blogger, and podcaster. If you listen to him on ATP, it’s hard not to like him, and anything he does is bound to get more than the usual upvotes on HN.

The developer is popular and APFS cloning is genuinely technically interesting.

(no, it's not a symlink)

COW filesystems are older than MacOS, no surprises for me. Maybe people aren't that aware of it?

CoW - Copy on Write. Most probably on older mainframes. ( Actually newer mainframes ).

"CoW is used as the underlying mechanism in file systems like ZFS, Btrfs, ReFS, and Bcachefs"

Obligatory: https://en.wikipedia.org/wiki/Copy-on-write

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