Dark data is all the stored information companies keep but never use—think old...

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

Dark data is all the stored information companies keep but never use—think old files, logs, or emails piling up unnoticed. Surprisingly, 60-80% of data goes untouched, costing businesses around $2.5 million each year in storage and management