Synology DX1211 delivers an effortless solution for volume expansion & data backup. The DX1211 seamlessly scales up the storage capacity by an additional 12 hard drives on-the-fly. The RAID volume can be expanded directly without having to reformat the existing hard drives, ensuring the Synology Disk Station continues its service during the capacity expansion. When created as an independent volume, the DX1211 provides an easy solution for backing up the Synology Disk Stations.