This Hard Drive

Buy.com has the Cavalry 2TB (2 x 1TB eSATA Drives) USB 2.0 External Hard Drive CADA002SA2-B for $490 with free shipping. New Customers can get $10 off $200.

Product description from Buy.com:

Never worry when one drive fails, data stays intact with this Raid storage. The optimum combination of mega storage capacity 2TB preconfigured in RAID 1 = 1TB mirrored with 3.0Gbit/sec!
SATA speed and superior RAID security, this powerful RAID subsystem comes in a 2-bay array with swappable hard disks and built in RAID controller.

Factory default GUI mode, but also supports RAID levels 0, 0/1 safe 33, or 0/1 safe 50, and offers automatic background rebuilding (in RAID 1). Its SATA interface provides a faster boot process and quicker loading of programs and data. Ideal for saving hefty files, video, music, protecting databases or working directly on the drive, it delivers high-capacity performance and Data Security.

Just install the SATA to eSATA adaptor cable and your ready to start!

FeaturesSeveral options for choosing how much data will be redundant using GUI software. Options include RAID 0, 1 and 0/1safe 33 or 0/1 safe 50. Automatically background rebuilding (in RAID 1)Plug & Play for Windows 2000 and newer in GUI mode.Black aluminum case with large 2