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Synology's DX513 Storage Expansion Unit delivers an effortless solution for volume expansion and data backup for selected Synology DiskStation models. The DX513 seamlessly scales up the storage capacity of the DiskStation by additional five hard drives on-the-fly when connected directly to an expansion cable. The RAID volume on the Synology DiskStation can be expanded directly without having to reformat the existing hard drives, ensuring the Synology DiskStation continues its service during the capacity expansion. When created as a separate volume, the Synology DX513 provides a great backup solution to its local hard disks in case of system failure.