I purchased this specifically to back my hard drive up before having it replaced. I did a few days worth of backups; that process was pretty easy and straightforward. For this, I give two stars. I took my computer in to have the hard drive replaced and when I got it back a few days later, I was unable to retrieve any of my backups because the drive is faulty and could not be recognized. I am waiting on a warranty replacement, for which I had to pay the shipping. I realize that any external hard drive can fail, but in addition to my existing frustration, WD redesigned these hard drives so they no longer have SATA connection, so I couldn't even get my data off if I were to crack open the casing.