Buffalo Tera Station III is a larger capacity NAS device with robust RAID 5 capability. The redundancy of four separate hard drives in RAID 5 or RAID 1 modes mean that even if a hard drive fails, your data is safe. With Hot Swap functionality, if a drive does fail, the Tera Station III automatically powers down the faulty drive, enabling you to safely remove & replace without losing any data, or down time. The replication function allows the connection of a second Tera Station via LAN port & replicates the data to improve reliability, fault tolerance or accessibility. The perfect solution for the home office or small to medium business that needs large, easy-to-deploy, easy-to-manage, redundant network attached storage.