As somebody who's runtime exceeds 17gb of data I can vouch for the importance of running a weekly back-up. Most windows versions has the free Microsoft Backup program in System Tools under Accessories and this can be used easily to do incremental backups of folders to other hard-drives. I have an external hard drive purely for back-up and every sunday my computer kicks into geat and back-ups my Runtime, poser working folder and other important folders. Don't risk losing anything, give up a few minutes a week and back-up. Best wishes Jody