Time Machine backing up huge files

Hello
I have a MacBook Pro (and a mini and air in my house) I initially backed up all my machines to the time capsule the MacBook Pro seems to want to regularly back up around 116GB which is about the size of the original back up. Given that my understanding is that it is only changes that are backed up I am perplexed at why this macbook is trying to back up such a large volume of data again. Any suggestions would be welcome. Just to say it is running 10.6.8 the Mini is running the same version and the Air is Lion.
Regards
Paul

Hi Bob
Thanks for the link after launching time tracker, I am getting this message The file “Data” couldn’t be opened because you don’t have permission to view it. To view or change permissions, select the item in the Finder and choose File > Get Info.
All the users have read and some write I assume time tracker is being blocked somehow from 'seeing' the file Data do you have any thoughts on how time tracker can 'see' the file
Regards
Paul

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