https://www.synology.com/en-us/dsm/6.1 https://www.synology.com/en-us/releaseNote/DS1812+
Welcomed changes:
* Enabling Btrfs file system on old machines
* Fast files clone within the same Btrfs volume
* Shared Folder Encryption: you can now encrypt an ordinary shared folder,
and/or decrypt an encrypted folder. This is useful when you want to move an
encrypted folder across volumes.
* More flexible RAID migration paths
