Dark data is all the information companies collect but never use, like old...

https://golf-wiki.win/index.php/What_Is_the_Fastest_Way_to_Spot_Files_Not_Accessed_in_Years%3F

Dark data is all the information companies collect but never use, like old files or unseen logs. It's huge—up to 80% of stored data can go untouched. That’s a big deal because managing this forgotten data can waste around $2.5 million each year