You should use: cp --reflink=auto You get file level deduplication. The command above performs a lightweight copy (ZFS clone in file level), where the data

You should use: cp --reflink=auto You get file level deduplication. The command above performs a lightweight copy (ZFS clone in file level), where the data blocks are copied only when modified. Its a copy, not a hard link. The same should work in other copy-on-write transactional filesystems as well if they have reflink support.