Leopard upgrade procedure?

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Sooper Fast!
When an Apple OS is upgraded, how does it do it? I'm talking on a technical level. Is it as good as a fresh install, or does it leave bits of code and files from the old OS lying around?
 
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It's efficient. Choose erase and install, or archive and install. The latter will put all your files in a folder.

No crap from the old OS will be left.
 

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