I connected a My Passport external hard drive and installed the software a few months ago and it seems to back up OK - until I updated the software! This crashed the computer badly with the hard drive just running flat-out constantly, even with the external drive removed. Nothing would function and the only way to fix the problem was to reformat and reload everything from scratch - which was very time-consuming. I was fortunately able to reload the software supplied with the My Passport (making sure I did not use the update) and was able to use the backup I had made initially which saved the loss af most of my valued files. The computer worked fine after this.
I have not used the external hard drive or the software since. A few days ago the computer, within a few minutes of loading up, would start running the hard drive flat-out again and all attempts to solve the problem proved futile, involving running up-to-date anti-virus programs and downloading (at my cost) and running a couple of programs that were supposed to fix this sort of problem - all to no avail. I had to do most of this in “safe mode” or within the first few minutes of Windows loading up as once the hard drive went crazy I could do little with the computer (a high specification Toshiba laptop running Windows 7). I decided to uninstall the WD program and presto everything is back to normal!!
I now have a rather expensive paperweight as I definitely cannot risk reloading the software again and write this as a warning to others.