500GB Velocity2 SATA RAID Backup System does all the backup work for you, supporting RAID 0, RAID 1 and JBOD, single volume on Two 250GB Drives, including easy setup, simple reminders and flex features and the Velocity2 with BounceBack ProfessionalPlus Software, making this the fastest high capacity external storage and data backup solution available. Serial ATA 2.0 eSATA / USB 2.0 interface and supports full Disaster recovery and Quick Restore.