Dark data is the hidden info your company stores but rarely uses—think 60-80%...

https://www.a1bookmarks.win/dark-data-is-the-information-companies-collect-but-never-use-often-making-up

Dark data is the hidden info your company stores but rarely uses—think 60-80% of inactive files just sitting there. This unused data isn’t harmless; it can cost businesses around $2.5 million each year in storage and management