Voyager Q hard drive dock from OWC: quick review http://eshop.macsales.com/shop/NewerTech/Voyager/Hard_Drive_Dock
Pretty slick and easy to use. After powering it up and it connecting to your computer you turn it off, drop a bare SATA drive ( 2.5 or 3.5 inch) into the slot on top. Then power it back up, format the drive and then start backing up. I making my first set of back ups presently, and will then make a duplicate set for off site storage. I went with the Voyager Q as it has USB 3.0, FireWire 800, FireWire 400, and eSATA connections. Cables for all connectors are included in the package.
I have several redundant bare SATA HDDs sitting around so I didn't have to purchase any for this purpose. I am backing up about 4TB of data so I'll be using 3x 1.5TB Western Digital Green Drives.
There is not much else to say about it. If it works it works.