Synology - Wikipedia
https://en.wikipedia.org/wiki/SynologySynology’s primary product is the Synology DiskStation Manager (DSM), a Linux-based software package that is the operating system for the DiskStation and RackStation products. The Synology DSM is the foundation of the DiskStation, which integrates the basic functions of file sharing , centralized backup , RAID storage , multimedia streaming, virtual storage , and using the …
Update | DSM - Synology Knowledge Center
kb.synology.com › system_dsmupdateAfter you update to a newer DSM version, you cannot roll back to a previous one. Synology NAS automatically runs a checklist to determine whether the new version is relevant to your system based on the services and system configurations. Therefore, available updates and latest versions may vary depending on your current DSM configurations.