Dark data is the info companies keep but never use—think old emails, documents,...

https://www.easybookmarkings.win/dark-data-is-the-55-of-stored-information-that-sits-unused-but-still-costs

Dark data is the info companies keep but never use—think old emails, documents, or system logs gathering dust. It can be 60-80% of all stored data, silently costing businesses up to $2.5 million a year in extra storage and management