Dark data is the inactive or unused information companies hold onto—about...

https://reidyxab469.iamarrows.com/do-i-have-to-move-petabytes-before-i-know-what-i-have

Dark data is the inactive or unused information companies hold onto—about 60-80% of stored data. It matters because it increases storage and backup costs and exposes organizations to higher ransomware and breach risks