Dark data is all the information companies keep but don’t use—like old emails,...

https://stateofseo.com/what-does-agentless-really-mean-for-storage-analytics-tools/

Dark data is all the information companies keep but don’t use—like old emails, logs, or files. It often makes up 60-80% of stored data and can cost businesses around $2.5 million each year in wasted storage and missed opportunities