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How to Get Mountain Lion to Use an Already Existing Time Machine Backup

Almost nothing is more frustrating than spending two days keeping your Macbook laptop in one location while it does a first-time Time Machine backup to your Time Capsule – especially when it’s not really a first-time backup, because you already have a perfectly good backup on your Time Capsule but your Macbook Air or Macbook Pro won’t recognize it, so it starts all over. We say “almost nothing” because what is even more frustrating is waiting that two days, only to have the backup stop before the full backup is complete, and having to start all over. Or completing that full backup, and then Time Machine still can’t connect to the new full backup, and wants to start another new one. If any of this has happened to you, here are simple, step-by-step instructions for what worked for us to force Time Machine to both complete a full backup to a Time Capsule, and to recognize that backup and use it, after going from OS X Lion 10.7.5 to Mountain Lion 10.8.2.