Western Digital My Book World Edition II - 4 TB (2 x 2 TB) Network Attached Storage for $329.99

My Book World Edition Home Network Storage It's easy to set up a central storage location in your home that is compatible with both Mac and Windows files. Simply connect the drive to your network router and you’re up and running in just a few minutes. Use the included back up software to protect your family’s PCs with automatic and continuous backup plans.