Still think you get the wrong picture here, let me show you where I came from again, right?
On this HP envy notebook I created an copy backup, for this Windows 10 has 2 options. Either put the copy backup directly on DVD or copy it onto USB device. Yet the copy backup onto USB device is also known as the recovery station.
So now I have this copy backup on USB media and in volume it is about 32GB in size, where as my USB media is about 500GB in size. Now I have 2 options here, either I clone the recovery station as an exact copy onto a smaller USB medium or I create a ISO file and I choose to create an ISO file from the recovery station.
Before I'd already create ISO files from regular existing DVD's and USB media.
When I checked the content of this recovery station, I then noticed it's EFI bootable.
Never before I'd create an ISO file from a EFI recovery station for an specific notebook that boot from UEFI.
And for that mather, I'd have no use here for an app like Rufus, as it is only to be used for burning an ISO file onto a DVD/USB medium, but not for creating an ISO file. To create an ISO file I rather use an app like ImgBurn because that app does convert an image file into an ISO file. And to make the DVD/USB medium bootable on the pc, a boot image file is to be added, extracted from the image file I want to convert.