Upgrade from Leopard to Snow Leopard
If I upgrade my OS from 10.5.8 to 10.6 will my Mac be reformatted, and therefore do I need to create a backup of everything on my Mac?? I have a MacBook Pro running Leopard.
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First determine if your Mac will run Snow Leopard:
http://support.apple.com/kb/SP575
If it will, order the disk from the Apple online store:
http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard
Though installing a new OS should not have any affect on user data, a backup is always prudent to have.
Ciao.