Hi everyone, First post here. Amongst other apple products I have an iMac which has all my pics, movies, photos etc. It's not turned on / used that much, roughly 5 times a year for backing up our iPads and phones. I am concerned about losing all of this if something catastrophic happened. For instance the pics and movies of my children are priceless to lose. Because of this I am thinking of getting an external hard drive to back all of this up. This seems to be a bit of a mine field with compatibility and reliability. I would appreciate some support with suggestions please. Thanks.