Dark data is the inactive or unused information stored but not analyzed, making...

https://domgodwinson38.gumroad.com/p/what-should-i-do-with-former-employee-folders-on-the-file-server

Dark data is the inactive or unused information stored but not analyzed, making up about 55% of enterprise data. It increases breach risks like ransomware attacks and drives up storage and backup costs, sometimes wasting millions annually