The DS has been deleting files that shed them in a bad light. They say they need to free up storage space. This is while they are continuously building new and larger data centers. I know this because I work for a company that supplies parts to keep the buildings cool. I'm hoping Bill Binney's company in the Netherlands is making backups. Don't count on the NSA according to this article: https://www.rt.com/usa/416483-nsa-surveillance-data-deleted/