I just got a WD Caviar Black 1TB HDD and I'm planning on using it strictly for backing up my files and documents. I'm not going to be putting it in a USB External Enclosure, but instead connecting it directly to one of my motherboard's available SATA II ports. Since I have my main OS in my RAID 0 array, would it be a good idea to even defrag my back up drive? Because I've never really found the reason to in previous back up drives that I've had. The speed was always steadily good im my experience. But any other input would be appreciated.