(1) You should pursue a resolution. Finally I had cause [never will I reset Mail & Calendar again] to restore a Windows system image, & it went quick & easy. Had it not, I was prepared to resort to an image made by DiscWizard. Had that failed, I was prepared to clean install. But System Image Recovery worked nicely from the 1809 built-in Recovery Environment (Shift+Restart). It restored my EFI & Windows partitions, leaving my Recovery partition alone presumably because I was using it.
(2) That is a big disappointment that an upgrade-install of 1809 did not cure it for you. That is one of the big guns that should fix everything. The only bigger gun is a clean install - which absolutely must work unless it is a hardware issue. DISM & SFC are actually lesser guns but worth a try...
Use the System File Checker tool to repair missing or corrupted system files
(3) Can it be you've got software running that could interfere with Backup & Restore? Turn off any 3rd-party anti-virus scanner/firewall. Even better, uninstall it. Windows Defender & firewall will auto-start & be just fine. Also, try it in a clean startup, which is easy to set up...
Perform a clean startup to determine whether background programs are interfering with your game or program
(4) Are you choosing to make the image to a "network location"? I've read that is problematical.