Dark data is information companies collect but never use—around 55% of stored...

https://tango-wiki.win/index.php/What_Is_a_Global_Metadatabase_and_Why_Would_I_Need_One%3F

Dark data is information companies collect but never use—around 55% of stored data often sits idle. This inactive data wastes storage and backup costs and increases ransomware and breach risks since it’s overlooked in security checks