Cannot make Windows 7 Rescue Disk or ISO

I have CB, and have installed a clean Win 7 to permit easy migration to Win 10 if desired.
To this end. I want backups at critical points.

Have successfully installed the Windows AIK for Win 7.

In CB, I have repeatedly tried to create a Rescue CD, but every time get a “failed” message about 50% of the way done.

What now?