Dark data is the information your company keeps but doesn’t use—often 55% of...

https://www.4shared.com/office/QTSyJxrlku/pdf-8319-24027.html

Dark data is the information your company keeps but doesn’t use—often 55% of stored data is dark. This unused data takes up space, driving up storage and backup costs, and it can increase your risk of breaches or ransomware attacks