Dark data is the inactive info your company stores but doesn’t use—often 60-80%...

https://garrettsbestblogs.theglensecret.com/how-do-i-check-if-dark-data-contains-pii-or-phi

Dark data is the inactive info your company stores but doesn’t use—often 60-80% of all data. It increases risks like ransomware exposure since old files may lack proper security