Key features plug n use design for seamless storage space upgrade online volume expansion on the fly managed from synology diskstation manager dsm synology expansion unit rx1217rx1217rp delivers an effortless solution for data volume expansion and data backup for synology 2u rackstation nas with additional 12 drive bays rx1217rx1217rp seamlessly expands the storage capacity of the connected synology nas on the fly synology rx1217rx1217rp is backed with synologyrsquos 5 year limited w