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?
If you backup your keychain as well as the file
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.