Synology DX513 delivers an effortless solution for volume expansion & data backup for selected Synology Disk Station models. The DX513 seamlessly scales up the storage capacity of the Disk Station by an additional 5 hard drives on-the-fly when connected directly by an expansion cable. Online Volume Expansion Dedicated Local Backup Solution Reliable Plug-n-use Design Hot-swappable HDD Design Auto power on/off with Disk Station Models When running out of hard drive capacity on the Synology Disk Station, Synology DX513 provides an easy way to immediately scale capacity by additional 5 hard drives. The RAID volume on the Synology Disk Station can be expanded directly without having to reformat the existing hard drives, ensuring the Synology Disk Station continues its service during the capacity expansion. Synology DX513 can be used as a dedicated local backup solution for the Synology Disk Station. When created as a separate volume, the Synology DX513 provides a great backup solution to its local hard disks in case of system failure. The HDD hibernation & system hibernation can be manually configured to take effect automatically when the system has been inactive for a period of time. This not only saves energy but also extends the lifespan of the hard disk. The DX513 will also smartly power on/off with the attached Disk Station, so no user intervention is needed to keep this system running smartly & efficiently.