Dark data is the information organizations collect but don’t use, often making...

https://mag-wiki.win/index.php/Dark_Data_in_Object_Storage_%E2%80%93_Why_Do_Buckets_Get_Out_of_Control%3F

Dark data is the information organizations collect but don’t use, often making up 55% of stored data. This hidden data creates storage and backup costs and increases ransomware and breach risks by expanding your attack surface