Dark data is the information companies store but never use, often making up...

https://wiki-velo.win/index.php/Is_$300,000_a_Year_Realistic_for_300TB_Plus_3.5PB_of_Cloud_Storage%3F

Dark data is the information companies store but never use, often making up 60-80% of their data. This inactive data takes up space and costs money—sometimes costing businesses up to $2.5 million a year in wasted storage and management