I'm trying to scan a series of handwritten letters that totals around 300 pages. I assumed that at some point the file would become too large so I continued to save my work. I'd do twenty pages then save. Twenty pages and then save again (over my original save). I finally reached the point where the file became too big (after 100 pages). However, when I went to retrieve the last saved version, it was no longer in my folder. Is there anyway to retrieve?