I have stuff backed up all over the place so decided to get an external storage device so I can centralize all my back ups. Plus I have my movie/TV collection on my network storage device and losing that would be a major pain in the back side. I ordered a 4 bay USB3.0/eSATA enclosure. It is non RAID. I decided that since it will be mostly static storage I did not need it. In the past I would just get the best price/gig WD cavier black drive and not give it a second thought. But with HD prices staying ridiculous I was looking for a less expensive option.