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4.4. Upgrade Related Issues

Refer to http://fedoraproject.org/wiki/DistributionUpgrades for detailed recommended procedures for upgrading Fedora.
In general, fresh installations are recommended over upgrades, particularly for systems that include software from third-party repositories. Third-party packages remaining from a previous installation may not work as expected on an upgraded Fedora system. If you decide to perform an upgrade anyway, the following information may be helpful:

System Configuration Backups

Backups of configurations in /etc are also useful in reconstructing system settings after a fresh installation.
rpm -qa --last > RPMS_by_Install_Time.txt