My scans range in size from about 270 MB (6x6)to over 700 MB (6x9 with layers). I have two external hard drives and try to back up all worthwhile files. I'm curious how others manage their large files making sure that they have copies in case one hard drive dies. The big space eater is saving photoshop files that contain layers. Maybe I should just save the original tiff file and the photoshop layers files. If I loose the psd file, I can always go back to the tiff. I'm curious how others manage their humungous files?