The DS220j is an entry-level 2-bay NAS that allows home users to conveniently back up and share their photos, videos, and documents. The private cloud solution runs the award-winning DiskStation Manager (DSM) operating system with its easy-to-use interface and applications to easily back up data from computers and mobile devices at no extra cost. Synology's comprehensive multi-version backup solutions protect your digital assets on computers (Windows/Mac) and mobile devices (Android/iOS) from attacks, including the increasing threat of encryption ransomware.