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Apple Time Capsule
There are two reasons I bought an Apple Time Capsule. First, I wanted a compatible define for 802.11n Wi-Fi access point, and I now own enough Mac products to make owning a backup device that can leverage OS X's Time Machine software.
A Time Capsule isn't cheap, but it makes backing up Macs a breeze.
Price: $299 for 2TB, $499 for 3TB.
Image source: Apple.