Windows 10 build 18950 leak shows a cloud restore option for a factory reset
 

If you’ve ever had a Mac that had become completely corrupted, or if you simply deleted the disk partitions, then you’ve probably discovered that Apple has a built-in solution. When you try to boot up the Mac, it will simply connect to the internet, download the version of macOS that came with your PC, and take you through the process of installing it. It seems that Microsoft has an idea in mind now that’s more similar to what Apple does. As discovered by Microsoft leakster WalkingCat, you’ll have the option to ‘cloud download’ Windows 10, or restore from the local image. I used FTP installation on Mandrake Linux ages before this ever became an option for the Mac, so it’s not like this is exactly a very modern or novel feature. Still, better late than never I suppose, and it will make a Windows install a much less cumbersome process if you can’t find your installation medium.

https://www.osnews.com/story/130402/...factory-reset/