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:
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.
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
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.