Every week my computers (PC andlaptop) prompt me to update the backup files, which I do. However, after about 6 or 8 weeks, the same program tells me to create a new backup set. This gets rather expensive after a short period, since once these discs are used, that's it. When you start a new backup , the previous set of backup discs are no longer any good for anything. Is using R/W discs suitable for this purpose, or would I be better off getting a large volume thumbdrive and using that stictly for keeping the backup program files on?