Dark data is the inactive or unused information that piles up in your...

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

Dark data is the inactive or unused information that piles up in your storage—often 55% of all stored data. It wastes money on storage and backup costs and increases risks like ransomware exposure since old files are less likely to be secured