I want to reinstall my Macbook, but i do not want to loose all my saved WPA/WEP Wi-Fi profiles.
Is there a way to back them up and restore them after the reinstall?
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If you backup your keychain as well as the file
and restore them on a new installed Lion, you won't lose them.
Another way would be to use the Migration Assistant on a Time Machine Backup of your old system, but this would restore ALL your system settings. That's probably not what you want, otherwise you wouldn't consider reinstalling.