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It is passively supported via snapshots and the Copy on Write feature.  The few times I have seen Synology comment on the matter, other deduplication services are not supported.


There are open source utilities that can look for file-level duplicates and submit them in batch to btrfs for deduplication.  I have used rmlint successfully, installed via syno-cli synocommunity package. I'm not aware of block-level deduplication that works on Synology btrfs.


Note that some of the dedupe utilities have specific btrfs version and kernel version requirements that DSM does not meet. Tread carefully!

Edited by flyride
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I have played around with deduplication and btrfs in the past. Even with good results.
But as dedup & encryption is not compatible and also one never does run a defragmentation or the deduplication will be destroyed I deleted my tests.

Deduplication is a very interesting feature for me but only if it's supported neat.

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