Dark data is all the info companies collect but never use—think old emails,...

https://city-wiki.win/index.php/How_Do_You_Reduce_Backup_Costs_by_Shrinking_Primary_Storage%3F

Dark data is all the info companies collect but never use—think old emails, logs, or files gathering dust. It’s huge, making up 60-80% of stored data. That’s a big deal because keeping and managing it wastes around $2.5 million every year