Dark data is all the information companies collect but never use—think 60-80%...

https://instaquoteapp.com/how-do-you-run-a-deletion-workflow-without-getting-sued-later/

Dark data is all the information companies collect but never use—think 60-80% of stored data just sitting idle. It matters because this inactive data wastes storage space and can cost businesses up to $2.5 million every year in unnecessary expenses