Dark data is the information your organization collects but doesn’t use, often...

https://www.mediafire.com/file/z8wf0i0mykosn7a/pdf-16913-36286.pdf/file

Dark data is the information your organization collects but doesn’t use, often making up 55% of all stored data. It increases costs through wasted storage and backup resources and raises breach risk since unused data is less likely to be secured