Can I backup and reinstall MacOS X to fixes problemes.

I want to reinstall Mac OS X to fix some of the problemes . Can I backup everything on external HD, reinstall OS (erase my HD) and restore all my systeme files, setting, and applications using time machine. If yes, do I have to be aware of something?
Thank you,
Jean Nichols
Montreal

Yes you can, but there's a good chance that reinstalling won't fix whatever problem(s) you are having and will just be a big waste of time. Describe in more detail what problem you are trying to fix.

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