System Image Backup failed, Errors 0x807800C5 and 0x8078004F

Some users on the Microsoft Answers forum are reporting that when using the Backup and Restore Tool and a USB external drive to create a system image backup on their Windows 10 PC, the operations fail with succession and/or a combination of error codes viz: 0x807800C5 and 0x8078004F. In this post, we will offer the most suitable solutions to this issue.

There was a failure in preparing the backup image of one of the volumes in the backup set (0x807800C5)

The mounted backup volume is inaccessible, please retry the operation (0x8078004F)

System Image Backup failed, Error Codes 0x807800C5 and 0x8078004F

If you’re faced with any of these error codes, you can try our recommended solutions and see if any of them help you resolve the issue.

Temporarily disable the Security software
Restart Volume Shadow Copy
Create System Image using PowerShell
Prepare external drive to backup multiple system images
Format external drive
Use third-party imaging software

Let’s take a look at the description of the process involved concerning each of the listed solutions.

1] Temporarily disable the Security software

Temporarily disable the security software and then try the operation and see if that helps.

2] Restart Volume Shadow Copy

Open Services Manager, locate Volume Shadow Copy services, right-click on it and select Restart.

Now try and see if that helped.

3] Create System Image using PowerShell

If you’re encountering these error codes using the GUI to create the system image backup, it’s possible the program is glitched. In this case, you can try creating the system image using PowerShell on Windows 10.

4] Prepare external drive to backup multiple system images

By default, you can only create one system image on an external USB drive. If you have an existing system image for a computer and are creating a new one for the same computer, the new system image will overwrite the existing one.

So, if you already have a system image on the external drive and encountering these error codes, it’s possible that for some reason the system is unable to overwrite the existing system image.

In this case, you can follow the instructions in our post to prepare the external drive to allow backup of multiple system images.

5] Format external drive

This solution requires you to format the external drive and then try the system image backup again. If that doesn’t work, you can try using another USB drive.

6] Use third-party imaging software

If nothing still works at this point, you can use any of the 3rd party Imaging, Backup and Recovery Software.

Any of these solutions should work for you!