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What I would do is have a single server setup for your tube (and other sites one another server) No cPanel, and using Nginx... Like AK said, have a pipe size and not an amount of transfer, and once you start getting close to maxing out your Mbps I'd put in some upstreams and load balancing on Nginx to pass off to a second server, and also use the second server as your media server via the upstream, that way while you're growing in the first server, yourtube.com/video/files/go/here.mp4 will load, but after you expand to the second server, you can move the video files over, and upstream the /video/ folder to the second server via Nginx and the videos will still load, just as if they existed on the current server, except they don't and are taking some of the load off.
Hope this helps.
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