Dark data is the information companies collect but never use—like old emails or...

https://johnathankvdj950.wpsuo.com/how-do-i-identify-duplicate-copies-across-file-shares

Dark data is the information companies collect but never use—like old emails or forgotten files. It makes up about 60-80% of inactive data in organizations, quietly taking up space and costing businesses around $2.5 million every year