This was not the case for me however and so,after many many attempts, I quite simply removed all folders from the 'd:\folders' location, restarted the computer and all works fine.... So if you are like me and are getting truly frustrated by this, it seems quite simple. Of course I wiped out all of my previous backups in the process but who cares, I haven't lost anything and the next scheduled backup will do what it is supposed to do now!