I think the image might be damaged in some way. This could happen for a lot of unpredicted reasons. I recommend you try some schedule backup do the backup regularly for you at a fixed time..then you could have more than one image and out of risks like this.
Hey, our company needs a backup software for server. We can't afford Acronis or Paragon. Our budget on the software is less than $300. I found easeus todo backup server..anyone have any idea about the software?