Installed new SSD boot drive, Time Machine won't backup

I installed a new 240 GB SSD boot drive (cloned using Super Duper) in my Mac Pro and want to use it as my startup disk. When I boot up using the new 240 SSD drive and try to start Time Machine to back it up onto a 500GB external drive it tells me it failed because the estimated backup size is over 2 TB. I suspect that Time Machine still has the last backup from my old boot drive, which was a 3TB hard drive. I go to Options and tell it not to back up any of my other hard drives but that doesn't help. So now what? How can I get rid of the last backup, which was from my 3 TB hard drive, so that I can backup a 240 GB SSD on a 500 GB external drive? Or is it another problem? Help!! Thanks!!

Problem solved, wasn't using Options/Exclude items properly.

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    polishedstaple wrote:
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    Message was edited by: tjk

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    Message was edited by: Pondini

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