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Apple AirPort Time Capsule
There are two reasons I bought an Apple Time Capsule. First, I wanted an 802.11ac Wi-Fi access point to play with, and secondly, I now own enough Mac products to make owning a backup device that can leverage OS X's Time Machine software worthwhile.
A Time Capsule isn't cheap, but it makes backing up Macs a breeze.
Price: $299 for 2TB, $399 for 3TB.
Image source: Apple.