Dark data is the inactive information companies store but rarely use. It can be...

https://hectorraaz187.lowescouponn.com/what-is-dark-data-management-not-the-marketing-version

Dark data is the inactive information companies store but rarely use. It can be as much as 60-80% of all stored data. This unused data takes up space and costs businesses millions—sometimes $2.5 million annually—in storage and management