Dark data is all the information companies collect but never use, like old...

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, like old files or unseen logs. It's huge—up to 80% of stored data can go untouched. That’s a big deal because managing this forgotten data can waste around $2.5 million each year