Hello again, So I just updated to Yosemite on my new cloned hard drive. I have a 4tb external drive that I used for the Time Machine backup, however that was back when I was on Snow Leopard with only two internal drives. Now that I don't need to back up my main Snow Leopard drive (because I am now using the cloned drive), if there any way I can make it that I don't back up that old drive anymore? It would be a waste of time seeing as I would be doubling the backup. I can't seem to find the option anywhere on Yosemite.