JonD & abacab
Absolutely invaluable advice, thanks so much! I am adding this info to my reference library under backups so I have a permanent record of this thread.
I do keep this machine offline and will keep it offline now until I get to Win 10 PRO. Just to set up the metered connection and get Macrium, gave windows almost enough time to download 1803. I got a notification that I should download and update immediately which I will not do...yet.
But here's what happened. My very first step after installing Macrium, was to create a rescue disc. The screen came up and said "WIM file not found, press click to build". I pressed build and got a "Failed".
Failed to generate Win PE VIM: The VIM could not be mounted.
The log entry gave two error messages.
Error 183: Cannot create a file when that file already exists
Error 50: The request is not supported
I googled the error numbers and "VIM not found" as well as searched the Macrium site. Nothing. I tried to join the forum but the free version gave me a license key which was not supported on registration. I couldn't find anything in the Knowledgebase.
But searching the help file gave this: Press CNTR and then can skip this step. The Build button has a dropdown which says Skip.
So I did that, and got the rescue media on DVD ( I have so many lying around) and then did my fist image of the C:// drive to a WD external 1 Tb HD. This way I can keep two at a time.
So I don't know if it worked or not. I do not know how to test it by booting into the rescue disc. Is it as above, set the DVD as the boot option in the BIOS?
Thanks again, I feel much better now! Just have to test the Rescue disc and hope it worked.