Any time you edit a drives partition table or install a new operating system there is always a small chance something could go wrong, so just be safe and have a backup ready. Important: Make sure you have a backup of your existing Mac OS X installation and disk before continuing with this guide. Now I’m going to assume you already have Mac OS X 10.7 Lion downloaded ( grab Developer Preview from Apple) and ready to go, and that you’re currently running Mac OS X 10.6. You don’t have to use Lion as your primary operating system – remember it’s a developer preview and not intended for every day use.
You are free to uninstall Lion at any time – without dual booting this requires a system restore from a 10.6 backup.Installing future 10.7 Lion releases will be easier.Why do this? Having two separate installations of Mac OS X has several advantages over installing Lion atop your existing 10.6 installation (the default method), here are the primary reasons I recommend dual booting instead:
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