Re: How much control/flexibility over the free W10 download?
"Does anyone know if the 3Gb download can be saved to a DVD/USB stick as a backup in case things go wrong?"
Looks like it.
"With Windows 10, you can create your own recovery media and back up the pristine state of the operating system and preinstalled software. If things go wrong and you are unable to refresh or reset your device successfully, you can boot the device using recovery media and reset to the prior pristine state."