QNAP TVS-EC1680U-SAS-RP R2 is the world's first unified NAS supporting Auto Tiering to deliver ongoing optimization of data across high-performance SSD, SAS drives & high-capacity SATA disks. The TVS-EC1680U-SAS-RP R2 delivers exceptional performance & supports cross-platform file sharing, comprehensive backup solutions, i SCSI & virtualization applications, & more practical business functions.