Using Backup and Restore (Windows 7), I had been unable to “Create a system image” using Windows Insider Program builds going as far back as build 18850. I am currently running Windows 10 Insider Preview Build 18963 (20H1) on a Boot Camp partition on a MacBook Pro (Retina, 15-inch, Mid 2012).
Attempting to Create a system Image would bring up the dialog box, “Where do you want to save the backup” and it would fail with another dialog box with the text:
“Windows could not find backup devices on this computer. The following information might explain why this problem occurred:
Close Windows Backup and try again.”
I searched the Windows Insider Feedback Hub, googled the web and Microsoft forums and I didn’t find a solution until a few days ago. On the Feedback Hub, in a post with the title, “Cannot create System Image in build 18956 FIX IT!“, CJH suggested disabling Windows Sandbox and virtual machine. (This link opens the Windows 10 Feedback Hub)
After disabling Windows Sandbox (Control Panel/Programs/Turn Windows features on or off/Windows Sandbox) I was able to create a system image again. I initially disabled Hyper-V Manager but after re-enabling it, system image still worked.