Dark data is the information companies collect but never use—often making up...

https://zaneznae304.lucialpiazzale.com/why-does-dark-data-create-operational-drag-for-it-teams

Dark data is the information companies collect but never use—often making up 60-80% of their stored data. This unused data takes up space, slows systems, and can cost businesses over $2.5 million each year in wasted storage and management