This RAID-based continuous data protection feature, called mirroring, is claimed to make the new dual-drive systems an ideal storage solution for photographers, home users and small offices and anyone looking for extra assurance that their data is safe.

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Consumers can also use the My Book Mirror Edition storage system and the included backup software to automatically and continuously back up their PCs. The mirroring feature provides users the added assurance of a redundant backup of their data.
Features include:
USB 2.0 interface;
Configured out-of-the box in RAID 1 (Mirrored) mode [RAID 0 (Striped) configurable];
Available in capacities of up to 1TB and 2TB
Eco-friendly operation with GreenPower drives that consume approximately one-third less power than standard dual-drive external storage systems and efficient convection cooling architecture and power-saving mode;
Designed without a fan for whisper-quiet operation in a home or office environment;
Automatic and continuous backup software that allows users to simultaneously save a change and have it backed up on the second drive for the ultimate in data protection.