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

https://www.kilobookmarks.win/dark-data-is-the-inactive-or-underused-information-stored-across-your

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