Windows 7 backup fails with Error code: 0x8078012D

Vista backups worked fine till I upgraded to Windows 7.
Now every backup fails with the same I/O error code 0x8078012D.

This is on a Toshiba laptop manually backing up over USB to external 500 GB harddrive.

Hi Searey,

Welcome to Microsoft answers.

The error might have occurred if the services related to Windows backup might have been disable, you may try restarting the service, follow the steps below:

1.      Click Start.

2.      Type Services in the Start Search.

3.      In the Services Windows search for Volume Shadow Copy in the list.

4.      Right click on the Service.

5.      Click on Properties.

6.      Select the Startup Type to Manual.

7.      Click OK.

8.      Now repeat the same for Windows Backup service.

If the issue persists, then I suggest that you run the chkdsk which repairs the chkdsk errors, follow the steps below:

i. Click on start

ii. Type cmd in start search box.

 iii. Right click on cmd.exe in the Program list and then select the option Run as administrator.

iv. If you are prompted for an administrator password or for confirmation, type your password, or click Continue.

 v. In the command prompt window, type the following command and press enter Chkdsk /R 

 vi. Press Y when you are prompted to check the disk the next time that the system restarts.

vii. Close all applications, and then restart the computer.

 Note: During the restart process, Windows checks the disk for errors, and then Windows starts. Now run the check disk in command prompt, follow the steps below:

Now when you try to perform backup, I recommend that you may try disabling the security software temporarily on the computer and perform a backup, make sure to enable the security software back on the computer.

Swathi B  - Microsoft Support.
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Question Info

Last updated July 22, 2021 Views 53,279 Applies to: