Buffalo's DriveStation Duo USB 3.0 Hard Drive Array is a two hard drive, RAID enabled USB 3.0 storage solution for small servers, creative professionals, offices and consumers who need redundant and high performance external storage. RAID 0 and RAID 1 support offering flexible capacity and redundant configurations or both drives can remain independent of one another. With USB 3.0 support and backward compatibility with USB 2.0, DriveStation Duo USB 3.0 works with almost any PC or Mac® computer and provides interface speeds up to 5 Gbps*. Equipped with NovaBACKUP® Business Essentials software, DriveStation Duo USB 3.0 can back up any PC including Windows® Servers and Exchange and SQL datastores. Plus, user replaceable hard drives offer easy maintenance with no tools required.