Their contribution grows at the same rate as their demand, creating limitless scalability for a fixed cost. The key to cheap file distribution is to tap the unutilized upload capacity of your customers. Serving large files creates problems of scaling, flash crowds, and reliability. Its advantage over plain HTTP is that when multiple downloads of the same file happen concurrently, the downloaders upload to each other, making it possible for the file source to support very large numbers of downloaders with only a modest increase in its load.
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