protected function addSyncIfConfigured(Configuration\Backup $backup, array $conf)
    {
        if (isset($conf['sync'])) {
            $backup->addSync(
                new Configuration\Backup\Sync(
                    'laravel-storage',
                    false,
                    [
                        'filesystem' => $conf['sync']['filesystem'],
                        'path'       => $conf['sync']['path']
                    ]
                )
            );
        }
    }