Need to re-install Lion due to disk errors. What should I back up first?

I am very new to Mac. I installed Lion about a month ago, and I have had periodic hangups ever since. Today, I did a disk verify, it found errors, so I attempted to repair from boot. That failed too, and message was that I need to remove any data I can and reinstall. Sigh.
I have a Time Machine backup from about a week ago. Should I run a new backup, or will that just capture the error that is requiring the reformat?
Should I just capture the files from the past week, and restore from the TM from a week ago?
Anyone have any advice? I haven't been on Mac long enought to even know what files I need to make sure I move across before doing a clean install.

I appreciate the help, but I am not quite following you.  You're saying, instead of doing a fresh TM backup, run CCC to a different drive. Then do what's necessary to get the Mac drive fixed, and reload everything form the CCC disk?
Why not just do that with TM? I'm sorry to sound obtuse, but this stuff is new to me. I really appreciate the help.
I currently have access to everything, I just want to do what's needed before that changes, if the HD is failing.
Thanks!

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