So I've got a 21" iMac purchased in Jan 2012. The hard drive failed and had to be replaced in June 2012. Paranoid that I was, I purchased Applecare (only time). Just a few minutes ago (after taking it back in again) my local apple store called me to tell me the hard drive failed again. So here we are with 2 hard drive failures in less than 18 months. I tried to talk Apple into giving me some kind of upgrade but (shocker) it didn't work. They are replacing the hard drive again! I've got 11 months left of Applecare and am worried that it will failed a 3rd time, the day after it runs out. Doesn't this seem a bit too much? I back up a lot of my stuff to Dropbox but I'm wondering if I should move all of it to the cloud? How reliable are iMac 2011 hard drives??? All advice is welcome.