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How to create an .iso file out of a USB Recovery Drive
I want to create an .iso file out of a USB Recovery Drive (a bit under 8 GB) I created. I want to do it because it was extremely slow (~2 h) to create the Recovery Drive and I also want to make a backup of the Recovery Drive in case both my C: corrupts and the USB stick corrupts.
I have already previously been successful at making an .iso file out of a USB Windows setup. Then with Rufus I wrote the .iso back to another USB stick and it worked, it booted perfectly. How I did that .iso file was with these instructions: Bootable Media and Images Preparation Guide with How-to Approach starting from section 2.2's UEFI part. It worked, but it has X:\EFI\Microsoft\boot\efisys.bin as the Boot Image. However, the Recovery Drive has no such file.
What is the correct way to make a working .iso out of a Windows 10 USB Recovery Drive? Or can I just simply copy the files to any USB stick and then add a boot sector or something?