Does Media Creation Tool download Windows, or does it copy files from the already installed Windows?

[Val So]

When i use Media Creation Tool to add Windows SETUP to my USB drive, where does the Tool get the files from - from Windows 10 that is installed on my computer, or does the Tool download Windows 10 from Microsoft servers?If i have viruses and my Windows 10 is infected, will the newly created Windows in the USB drive, be infected, too, if the file is created by the Tool extracting files from the already installed Windows, which is infected?

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