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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 41,366
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, Yosemite

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You can backup everything by using Time Machine (which you should be doing anyway). Make sure the external drive is formatted to HFS+ Extended Journaled in order for Time Machine to use it.

Install the Snow Leopard upgrade over Leopard. During the process you'll be asked if you have a backup. Reply yes and make sure the external with the TM backup is attached. The Snow Leopard upgrade will update all the necessary system files and use your TM backup to restore all your data, settings, apps, etc.
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