Dark data is the info companies collect but never use—like old files or logs....

https://fast-wiki.win/index.php/Why_Is_Our_Backup_Taking_Longer_Every_Month%3F

Dark data is the info companies collect but never use—like old files or logs. Up to 80% of stored data can be inactive, creating storage costs and security risks. It also clutters AI systems with useless noise, making insights harder to get