In the first installment of Why Information Must Be Destroyed I discussed how not discarding worthless hard copy documents, even though they appear to have no value is a security risk. This is commonly known as disk sanitization or data purging. Any storage medium that contains confidential or personal information should be addressed in policies regarding access, retention, handling and destruction. Smartphones often contain a poorly protected image of the user’s complete inbox, contact information and other confidential information present on their workstation.”]
Source: https://www.csoonline.com/article/2123985/why-information-must-be-destroyed–part-two.html