Dark data is the information stored but not actively used, often making up 55%...

https://wiki-square.win/index.php/Gartner_May_2026_Agentic_AI_Storage_Report_%E2%80%93_What_Does_It_Mean_for_Us%3F

Dark data is the information stored but not actively used, often making up 55% of corporate data. This unused data increases storage and backup costs and raises breach risk by expanding your attack surface. It can also expose you to ransomware attacks