Booting to a Live USB/DVD/CD and then doing the backup while in the booted Live OS would minimize the chances of corruption of the backup, either reading from i

Booting to a Live USB/DVD/CD and then doing the backup while in the booted Live OS would minimize the chances of corruption of the backup, either reading from it or writing to it. Not ironclad but pretty good. Issues with it that first come to mind are the live operating system image was already compromised when it was written to say the USB disk, or compromised firmware, and of course user error (nothing to do with ransomware in this case). I am not familiar with this stuff so I may be missing something very important, if so tell me about it.