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Windows Backup Did Not Complete Successfully, How to Fix?

Updated on Apr 15, 2019 by Jean to Backup Utility

This page explained why Windows backup failed due to error 'Windows Backup did not complete successfully' or 'the last backup did not complete successfully' in Windows 7, 8 and 10, and introduced 3 best ways to fix the incomplete backup in Windows Backup and Restore program.


"My attempts at backups continue to fail with 'Windows Backup did not complete successfully' and when I click the 'Options' button it gives me details of why and says 'The disk where your backups are being saved doesn't have enough free space", which is totally incorrect."


'Windows Backup did not complete successfully', or sometimes it says 'the last backup did not complete successfully' is a common setback that Windows users would probably encounter, especially when they utilize an external backup Hard disk drive or a USB stick.

Here are some possible reasons that explained why Windows fails to complete the task.

  • The backup operation did not accomplish before the time-out period ended.
  • Files were infected by the virus and had been corrupted. Hence, Windows could not find the target files, or it simply skipped some files.
  • i/o device error, etc.


Only an intact backup takes effect as soon as computers were subjected to severe data loss or system crash. Therefore, it's critical to know how to deal with Windows Backup did not complete successfully. Altogether, this page decided to introduce 3 best ways as emergency measures that basically reduce your anxiety.

Fix 1. Immediately Use Another Backup Software and Check for Errors

Download EaseUS Todo Backup and install it on the computer where you did a backup with the in-built Windows Backup and Restore program, for the purpose of testing the error. If the recommended free backup software executes the backup without hassle, then the problem is from the program itself you were using. It's time to think about giving it up and turning to the new one.

Empty the external hard drive or USB flash drive that you want to backup files to. If you have important data saved there, please do remember to move them away so to avoid data overwritten issue.

Step 1. Connect the external hard drive or USB flash drive to your PC and run EaseUS Todo Backup.

Step 2. Click the left top icon and expand the pane, click "File Backup".

elect file backup mode.

Step 3. Select the specific files that you want to backup to external hard drive or USB. And then click "Browse" to navigate the external hard drive or USB flash drive as the file backup destination.

Select external hard drive as backup destination.

If you prefer to create a file backup plan and automatically back up files to your external hard drive or USB flash drive, try below tips:

1. Click "Schedule: Off" and click "Upon even" to set automatically backup files as USB device plugged in (only the device on which you created tasks).

Set to automatically backup files to external hard drive.

2. Click "Save" to keep the changes.

Step 4. Click "Proceed" to execute the file to external hard drive/USB backup operation.

EaseUS Todo Backup will do the automatic backup job after the first full backup of all selected files or folder if you've set the program to automatically back up files to your external hard drive or USB once it's plugged in your computer.

Fix 2. Manually Delete All Old Backups in the Backup Location

Old backups may cause an interruption of backup software. So, let's try to remove all the existing backup files or folders by deleting or transferring them to another drive, and do the backup again.

After then, use some antivirus software you trusted to scan and remove malicious software and viruses from both your source disk and destination disk. Try to create the backup again.

Fix 3. Run CHKDSK to Check Disk Errors

Step 1. Press Windows Key + X simultaneously, type cmd and click "OK" to open Command Prompt.
Step 2. Type the command chkdsk D: /f /r /x and hit enter. (d is the drive letter of the hard disk you wish to fix errors on it)

Chkdsk will work hard to locate the bad sectors on the selected drive first, and recover readable information and fix the disk errors.