Be aware that your plain paper fax machine is making two copies of each printed incoming fax. One copy is on paper. The other copy is in the fax film cartridge that you eventually toss into the dumpster. It doesn't take much to recover the images from the discarded roll of film. Although the images will be reversed, you can hold them up to a mirror and easily read them. To avoid this security exposure, you need to destroy the spent film before it reaches the dumpster.