Dark data is the inactive or unused information your company stores but doesn’t...

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

Dark data is the inactive or unused information your company stores but doesn’t analyze or manage. It can make up 60-80% of your data, leading to wasted storage and backup costs. Plus, it increases your risk of ransomware attacks and data breaches