Dark data is the information companies store but rarely use—up to 60%-80% of it...

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

Dark data is the information companies store but rarely use—up to 60%-80% of it sits inactive. This unused data can rack up storage costs, create security risks, and add noise that throws off AI projects