Dark data is the inactive or underused information stored across your...

https://romeo-wiki.win/index.php/Why_Do_RAG_Pipelines_Get_Worse_When_You_Add_More_Documents%3F

Dark data is the inactive or underused information stored across your systems—often 55% of your data. It poses real risks like ransomware exposure since forgotten data may lack proper security. It also drives up storage and backup costs, wasting up to $2