Data Deduplication, user storage quotas, and other recently launched administration features are now available on all Amazon FSx file systems
Amazon FSx for Windows File Server, a service that provides fully managed native Microsoft Windows file systems, has now made Data Deduplication, user storage quotas, and other administration features launched on November 20, 2019 available to all file systems. Until today, these features were available only on file systems created since November 20. Now, storage administrators can use these features on any existing Amazon FSx file system.
Source:: Amazon AWS