May I suggest for external hard drives to get something like this. You can get up to 5 TB of storage or more depending on the size of your hard drives and number of bays of your enclosure. They can be purchased with different interfaces (Firewire, USB 2.0, eSATA).
http://images.frys.com/art/product/b...251847.box.GIF or http://www.stardom.com.tw/ST6600A.gif
