How do I get the internet speed that of a hosting company? [closed]

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http://serverfault.com – I own a popular website, heavy on traffic and space. I can't solely trust my hosting company with backups, plus - hardware is expensive to rent. So I am looking into hosting the website in-house. I called my ISP to set up a connection, the price is right, but maximum they can do is 50Mb/sec. I need at least 200Mb/sec and more in the future. How do hosting companies do it? Do I purchase 4 separate connections and somehow route them into one server? Or do I have to rent an office in a specific area? I'm in the Tacoma, WA area, if it matters. How do I get the speed that of a hosting company? (HowTos)