Have two external USB drives, both are identical manufacturer, identical capacity (300 GB), partitioned and formatted the same (full drive partition, NTFS). When using ATI to image the source to the destination, scheduled backup fails every time, because space runs out (source drive is nearly full, but not quite). These drives are used by a photographer, so the content on the source drive is all images (JPGs and RAW) in individual folders. I saw another post in this forum saying that if the source is heavy on image or other compressed files, I should choose "no compression" in the options when I back up. I tried that; but backup still fails due to lack of space. Any ideas?