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Windows 10 includes a new peer-to-peer download feature for updates and Windows Store apps. By default, Windows will automatically use your PC’s Internet connection to upload updates, hiding the option to disable this five clicks deep in the operating system.
You can continue to use peer-to-peer updates on your local network, but you may not want to waste upload bandwidth to help reduce Microsoft’s bandwidth bills. This is especially true if you have data caps on your Internet connection.