My MacBook is backing up with Time Machine to my Time Capsule. I took my MacBook abraod for 6 weeks and worked on it without backing up, because the Time Capsule was at home. Now I came back and Time Machine started a full back up (or almost a full one?). I was wondering what happened and found out that all previous back ups (the over 6 weeks old ones) are gone. I cannot find them, neither in Time Machine nor in Finder. What could possibly have happened and how can I retrieve my back ups? I trusted that the combination of Time Machine and Capsule would do the job. Now I am at a loss. Please help!