I have snow leopard 10.6.8 and want to download lion 10.7. Do I have to erase by harddrive?

OS X Lion (10.7)

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    No, upgrading your Operating System does not require you to erase the hard drive. All your files, applications, and settings will be transferred over. Be sure to backup your computer using a external hard drive + Time Machine first, to be safe. Also, verify all of your 3rd party programs that you've downloaded/installed and make sure they are compatible in 10.7 or have updates to make them compatible.

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