Dark data is the info your company collects but never uses—think old files,...

https://www.bookmark-tango.win/dark-data-is-the-unused-information-stored-in-your-systems-often-making-up-55

Dark data is the info your company collects but never uses—think old files, forgotten logs, or unused reports. It can make up 55% of your stored data, tying up space and costing you money