Bug in path for index.html file

If version 1.5.4, there is a bug for the path to generate the wp-content/backups/index.html file. There is a “/” missing so you end up with instead with a file wp-content/backupsindex.html
To fix the problem, in Classes/class-wp-backup.php line 207, replace :
$silence = WP_Backup_Registry::config()->get_backup_dir() . 'index.php';
with :
$silence = WP_Backup_Registry::config()->get_backup_dir() . '/index.php';

http://ww.wp.xz.cn/extend/plugins/wordpress-backup-to-dropbox/