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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
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While it's true that your Time Machine backup will restore all your applications and settings, you need to understand that it will not overwrite system files and kernel extensions that are already in place from the clean install. That's the real purpose of doing a clean install. Additionally, any fragmentation of the drive that was incurred with the upgrade will be removed.

A clean install may speed things up for you and remove any of the little glitches that are left over from the upgrade to Lion from Snow Leopard. Just make sure you have a good Time Machine backup before doing a clean install.
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