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

https://www.third-bookmarks.win/dark-data-is-the-information-your-business-collects-but-never-uses-often

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