If you want 1 TB to back up another TB, look at a Western Digital Mirror Edition 2 TB set up -- one automatically and continuously backs up the other:
http://www.wdc.com/en/products/products.asp?driveid=466
Wish I had this set up. Instead I have 2, 1 TB Western Digital external drives, and I periodically back one up to the other.
Been happy with the two I have.
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