Resilient File System (ReFS) is the new file system by Microsoft introduced in Windows Server 2012 and 2012 R2 (and 8.1 as a consequence), which finally comes to a stable version in Server 2016. It was born to optimize data management and guarantee integrity and persistence to damages, even in the case of large data sets and regardless of the underlying hardware structure. Key points of ReFS are integrity, availability, scalability and proactive correction of errors.