Many digital copiers are now able to store the scanned documents on flash memory or hard drives. This could pose a privacy/security risk, if the drives are improperly accessed, or if they are lost or resold without being scrubbed first.
Even the simple act of making a photocopy now poses privacy risks. In response to a letter from Massachusetts Congressman Edward Markey, the FTC has responded and agreed to investigate the privacy risks posed by digital copiers that store information on internal hard drives.
If you have photocopiers, you should investigate what type of storage devices they have. And if you or your staff use public photocopiers, you should establish policies about what type of information cannot be copied on a public machine.