I made a System Image to an external USB drive months ago and had a system crash.
I replaced the HD's and attempted a System Image Recovery by booting up using the System Recovery Disk I made and having the external USB drive connected.
When the System Image Recovery tries to scan for backup images it can not find them. I can browse the USB drive using the DOS prompt and the system sees the image backup files.
So I did a clean install on the system and attempted recovering the system image back again.
Still could not recover.
I then did a test System Image to the USB drive successfully and then attempted to recover, system can not find the backup files, but I do see the backup files in the \WindowsImageBackup folder on the USB drive.