Dark data is the inactive or unused information organizations accumulate, often...

https://elliottkykp923.yousher.com/what-are-common-examples-of-dark-data-in-a-company

Dark data is the inactive or unused information organizations accumulate, often making up 55% of stored data. It raises breach and ransomware risks since unmonitored files may hold vulnerabilities. Storing this data also wastes money—sometimes $2