Hi Ricardo, No, I do not use the build in hard drive for my back ups. I have an external drive which I've been using for back ups. Now when I try to back up, time machine tells me that the disk has changed and that somebody may be trying to trick me in to using a different disk for back up. But when I go into time machine prefs, my external drive, the one I've used all along, is listed as the drive to which back ups will go. I have only that drive and my internal drive, which is the drive being backed up. There is no 3rd drive anywhere, nor has there ever been one on this system. So I'm confused.
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