>fdupes will let you make hard links on any filesystem, but hard links do the wrong thing when you edit them or need different permissions
Hard links mostly work as you tell them to. You may need to set things up properly, but it's essentially the same thing being done.
>fdupes will not let you reconcile duplicates in snapshots on ZFS
Why not? The files are kept in a hidden folder in the base directory.
>ZFS deduplication is block-based
It is also live. You don't gain Mich with offline block deduplication over file, though it is better. Live deduplication is a feature even if unnecessary for most.
Hard links mostly work as you tell them to. You may need to set things up properly, but it's essentially the same thing being done.
>fdupes will not let you reconcile duplicates in snapshots on ZFS
Why not? The files are kept in a hidden folder in the base directory.
>ZFS deduplication is block-based
It is also live. You don't gain Mich with offline block deduplication over file, though it is better. Live deduplication is a feature even if unnecessary for most.