Automated course backups are not working. When using admin/cron.php I get the error that Backup is already running. Using the automated_backup.php does not work either. When I first upgraded, it worked for two days (which incidentally coincides with the number of days worth of backups I decided to keep - perhaps it is having issues deleting old backups?) and then quit. Next due date in backup log is set to 1/10/2011.