Dark data refers to the inactive or unstructured information stored but not...

https://delta-wiki.win/index.php/How_Do_I_Create_a_First-Week_Plan_to_Tackle_Dark_Data%3F

Dark data refers to the inactive or unstructured information stored but not used, often making up 55% of enterprise datasets. It increases storage and backup costs and exposes your systems to ransomware and breach risks