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If you are running a 4.7.1 or 4.7.2 instance of Fedora that had been upgraded from a previous version (4.7.0 or earlier), and you do not believe it has ever been shut down ever since upgrading to 4.7.1 or 4.7.2,  you must make a backup via fcr:backup immediately.  To recover from this bug, take a backup (which will be corrupted in a particular way), fix the backup, and restore into an instance of 4.7.3.  All users should take a backup of their Fedora instance before upgrading to 4.7.3 just to be safe.

If your repository is too large to perform a backup of both objects and binaries, a backup utility is available for generating a "object-only" backup.