Synology America Synology Expansion Unit RX1213 Synology RX1213sas delivers an effortless storage capacity expansion solution for Synology RackStation RS10613xs+ by adding 12 drives on-the-fly while directly connected. When storage capacity on the Synology RS10613xs+ reaches its limit, Synology RX1213sas provides an easy way to immediately scale up by additional 12 SATA, SAS, or SSD drives for flexibility and balanced performance. Volumes on the Synology RS10613xs+ can be expanded directly without having to reformat existing drives, ensuring that service on Synology RS10613xs+ continues during capacity expansion. Created as an independent volume, Synology RX1213sas provides an easy means of backing up Synology RS10613xs+. - New Item.