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

https://aged-wiki.win/index.php/How_Does_Dark_Data_Increase_Ransomware_Risk%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