I have a weekly backup scheduled for sunday nights - i use an external usb hard drive (L:\) as my storage, and for some reason over the weekend it was disconnected. this meant that when the backup started it couldnt find the backup location and failed. Since that happened my C:\ drive seems to have filled up (100 gig now unaccounted for) Is it possible that the failed backup process has created a (hidden?) file on C:\ ? in windows explorer i've checked " show hidden files" and "show operating system files" but i've not been able to find anything. any help with this issue would be very much appreciated.