“Having” is a concept whose utility varies based upon the next term: “accessing”.
There was a good article in Wired a few years back. It talked about the Data Center but also about the Tennessee facility and others that had to “query” the data. An analyst and programer team has to look for everything. It has to hunt the needle in the haystack. It has to stop looking for incoming missiles (or whatever that team is looking at) and look for FBI Texts.
I should have continued. A search engine crawls, based upon parameters, and then caches. When it searches, it searches what was previously crawled.
I think the data center may hold it all, but if it didn’t meet the parameters to be cached, it is not so easy to crawl again all the data in the world.