Dark data is the info companies keep but never use—think old files, logs, or...

https://uniform-wiki.win/index.php/How_Do_I_Deal_with_Old_Media_Assets_and_Temp_Files_at_Scale%3F

Dark data is the info companies keep but never use—think old files, logs, or emails gathering dust. It makes up about 60-80% of stored data, yet often goes unnoticed. Ignoring it can waste around $2.5 million every year on storage and management