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How to fix Windows 10 backup error 0x807800c5?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The windows 10 backup error 0x807800c5 is a very common error code that can occur for a number of reasons. The most common reason for this error code is that the backup file is either corrupt or missing. This can happen if the backup file is not properly created or if it is not properly saved. Other reasons for this error code include the backup process being interrupted, the backup file being damaged, or the computer being unable to access the backup file.

Users typically search for a solution by asking about:

  • windows 10 error code 0x807800c5
  • windows 10 backup error 0x807800c5

1. Check if the external hard drive is properly connected

  1. Open the "Computer Management" application.
  2. In the "Computer Management" application, under the "Storage" node, select the hard drive that you want to check.
  3. In the "Storage" node, under the "Device Manager" node, if the hard drive is properly connected, you should see a yellow exclamation point next to the "Hard Drive" node.
  4. If the hard drive is not properly connected, you should see a red exclamation point next to the "Hard Drive" node.

2. Check if the external hard drive has enough free space

  1. Open Command Prompt (Windows 10) and type the following command: diskpart
  2. Type the following command to list the disks in your computer: diskpart list disk
  3. Type the following command to check the size of the C: drive: diskpart size c
  4. If the C: drive is less than 50% full, then the external hard drive has enough free space to fix windows 10 backup error 0x807800c5. If the C: drive is more than 50% full, then you will need to delete some of the files on the external hard drive to free up space.
  5. To delete files from the external hard drive, type the following command: diskpart delete disk disknumber For example, if you want to delete the file "C:\Program Files (x86)\Windows Defender", type the following command: diskpart delete disk 1

3. Check if the external hard drive is formatted correctly

  1. If you have an external hard drive that you want to use with Windows 10, you first need to make sure that it is properly formatted. To do this, open the "Start" menu and click "Control Panel."
  2. Under "System and Security," click "Hard Drive Management."
  3. On the "Status" tab, make sure that the "Format" column is set to "NTFS."
  4. If the "Format" column is not set to "NTFS," click "Format" and then follow the instructions that appear on the screen.
  5. After the external hard drive is formatted, you can use it to store your Windows 10 backups. To do this, open the "Start" menu and click "Backup and Restore."
  6. Under "Backup," click "Add a Device."
  7. On the "Select a Device" screen, click the external hard drive that you want to use to store your Windows 10 backups.
  8. In the "Select a Volume" dialog box, make sure that the "Backup Volume" check box is check marked.
  9. Click "Next."
  10. On the "Select a Destination" screen, make sure that the "Backup to" check box is check marked.
  11. Click "Next."
  12. On the "Confirm Back Up" screen, click "Back up."
  13. After the Windows 10 backup is completed, close the "Backup and Restore" window.

4. Check if the external hard drive is set as the default backup location

  1. Click on "Start" and then "Settings".
  2. Click on "System and Security".
  3. Under "Backup and restore", click on "Backup".
  4. On the "Backup settings" window, under "Backup location", select the external hard drive that you want to be the default backup location.
  5. Click on "OK".
  6. Restart your computer.

5. Run the Windows Backup and Restore troubleshooter

  1. Open the "Troubleshooting and support tools" in Windows 10.
  2. Click on "Backup and Restore."
  3. Click on "Troubleshoot backup errors."
  4. Click on "Windows 10 backup error 0x807800c5."
  5. In the "What do you want to do?" window, select "Run the Windows backup and restore troubleshooter."
  6. Click on "Next."
  7. In the "Troubleshooting steps" window, select "Check for errors."
  8. Click on "Next."
  9. In the "Check for errors" window, select "Check for errors on the source disk."
  10. Click on "Next."
  11. In the "Check for errors on the source disk" window, select "Check for errors."
  12. Click on "Next."
  13. In the "Check for errors" window, select "Check for errors on the destination disk."
  14. Click on "Next."
  15. In the "Check for errors on the destination disk" window, select "Check for errors."
  16. Click on "Next."
  17. In the "Check for errors" window, select "Check for errors on the media."
  18. Click on "Next."
  19. In the "Check for errors on the media" window, select "Check for errors."
  20. Click on "Next."
  21. In the "Check for errors" window, select "Verify."
  22. Click on "Next."
  23. In the "Verify" window, select "Yes."
  24. Click on "Finish."

If the answers above didn't work then you should also try:

  1. Update or reinstall the driver for the external hard drive.
  2. Run chkdsk on the external hard drive.
  3. Restart the computer and try backing up again.