[adrian_b]

Also XFS has deduplication now, already for some time, at least one year or two.

[BlackLotus89]

btrfs has deduplication as well.

In theory full file deduplication exists in every filesystem that has cow/reflink support

[Tobu]

fclones for example covers it well for any filesystem with reflinks:

https://lib.rs/crates/fclones

fclones group |fclones dedupe