Time Machine - each time backing up 200GB or more

I have Mac Pro with multiple drives installed. It is running the latest version of Snow Leopard.
I have dedicate 2TB Time Machine Drive, that is currently backing up 1.5 TB of data on my machine.
I use multiple machines (six all together) and I have not had this problem on any of my other puters. When Time Machine runs its hourly backups, occasionally it is backing up 200GB, or more, of data - even though I have not been changing, deleting or adding data at that volume. I find it very confusing as to why it is constantly backing up so much data.
Often my oldest backup is from the day before, or maybe two days. Currently oldest backup is from May 10, but after running the latest backup (225GB) it will probably read May 21 (yesterday)
Let me say again, that the work I have done today does not consist of 225GB of data changes. I have been editing photos in PS and LightRoom, but they were already on the hard drive. We are talking about seven image files. So why does TM need to backup 225GB of data?
Any Thoughts?

Hi, and welcome to the forums.
See #D4 in Time Machine - Troubleshooting (or use the link in *User Tips* at the top of this forum). It lists some common causes of extra-large backups, and shows how to determine just what's being backed-up, so you can find the problem.

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