Peter Roe peter nothere.co.uk wrote:

Thank god I kept windows 7 on a separate hard drive - that
continues to work as good as gold.

You must have an ultraportable PC (smartphone) you want to use
with it. Otherwise, moving from Windows 7 is bad. Yes, having a
fallback operating system is a good idea. Another good idea is
making incremental copies of your new installation, using Macrium
Reflect.