TrueNAS SCALE is the first release of TrueNAS on Linux. It is Debian-based as opposed to the original which ran on FreeBSD. After 18 months of development and testing effort, TrueNAS SCALE is now released as a newest addition to the TruNASs family of storage software.

Source: LXer – TrueNAS SCALE 22.02 Is a Game Changer in the Linux NAS Field