3 TB external for Time Machine backup of /new/ 2 TB HD

i feel like i finally got things to stop moving around with my 2 year old move to mac and i am wondering the following:
i have a 3 tb external that is backing up my MacPro internal Snow Leopard drive that is 1 TB. I also have an additional 1 TB internal drive that is running a clone backup using CCC.
i would like to upgrade to Lion and have 2 - 2 TB Black Caviar drives that i am considering using to replace the 2 - 1TB drives listed above.
should i start my TIME MACHINE backup to the 3 TB drive /fresh/ and should i expect problems with a new 2 TB primary drive?
I just can't see dropping more cash on an even bigger drive but at the same time i could use the extra space with the 2TB primary drive.
TIA

Not to worry.
See item #E3 of the Time Machine - Troubleshooting *User Tip* at the top of this forum.

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