You don ' t even need to make a bot net . Just think of the millions of UK citizens and devices . All these devices are pinging web servers for news , weather , time syncs , email fetches , facebook messages , snapchat ~~ nudes ~~ notifications etc . There are so many background processes that will need to be recorded ON TOP of actual internet browsing . I myself visit hundreds of web pages every day . As do the other staff in my office . Absolutely all of this needs to be stored and indexed by our ISP . After a short period I believe ISPs will end up complaining of the cost of this huge amounts of data storage as it needs to be kept for a year . So just before two years is up there will be almost two years full of millions of peoples internet history . Can you even imagine how much physical storage will be needed for that ?