The ReFS filesystem is commonly used for Virtualization, Backup, and Microsoft Exchange because of its resiliency, real-time tier optimization, faster virtual machine operations, and great scalability. But until recently, ReFS didn’t support data deduplication, which was available on NTFS formatted volumes only. Data deduplication can provide significant savings on storage costs by using block-level technology to reduce the number of space files take up on a disk. Windows Server 2019: Dealing with Performance Problems between Backup Jobs and ReFS.
