https://kb.synology.com/en-global/DSM/tutorial/Which_models_support_data_deduplication
Which Synology NAS models support data deduplication?
- FS6400, FS3600, FS3410, FS3400, FS2500
- HD6500
- SA6400, SA3610, SA3600, SA3410, SA3400
- RS4021xs+, RS3621xs+, RS3621RPxs
Requirements:
- Data deduplication is only supported on Synology SSDs and Btrfs volumes. You need to create a storage pool consisting entirely of Synology SSDs and then create at least one Btrfs volume.
- Data deduplication can only run when the volume status is Healthy.
- Data deduplication requires you to Enable usage detail analysis for the Btrfs volume.
Notes:
- RS3621xs+/RS3621RPxs and FS2500 need at least 16 GB of memory to enable data deduplication.
Configure Data Deduplication:
https://kb.synology.com/en-global/DSM/help/DSM/StorageManager/volume_btrfs_dedup?version=7
Configure Snapshot Replication and Data Deduplication:
https://kb.synology.com/en-global/DSM/tutorial/Configure_snapshot_replication_and_data_deduplication
DiskStation models that support Tiny Btrfs Data Deduplication in DSM 7.2.1
- DS1522+, DS1621+, DS1621xs+, DS1821+, DS1823xs+, DS423+, DS723+ and DS923+.
These models have "tiny btrfs data deduplication" enabled and only need 4GB of memory or more.
In my test on a DS720+ with only 2GB of memory I got a message saying at 4GB of system memory was needed. https://www.reddit.com/r/synology/comments/18oyu21/data_deduplication_only_needs_4gb_of_memory/