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They gave me macbook for development, it's quite powerful, but I need to upgrade i to OS X Lion because otherwise I can't run Xcode 4.X. How to upgrade but to save existing data somewhere on the hard drive? Thank you

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You should be able to upgrade without loosing any data, as long as you do not opt to have the HD erased or formatted prior to installing the OS, during the installation process.

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Are you sure? I thought this is true only for one level upgrade... – Vladimir Stazhilov Sep 26 '12 at 12:15
10.7 officially allows for direct upgrade down to 10.5.8. – MacLemon Sep 29 '12 at 19:59

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