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Windows Backup Did Not Complete Successfully

Updated by Gemma on Nov 29, 2021
Written by Jean


"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."


There are two common error messages related to Windows Backup failed problem. One is "Windows Backup did not complete successfully", and the other is "the last backup did not complete successfully". Both two messages hint that Windows has failed the backup task.

Many reasons would prevent the backup process from succeeding, below are the most common ones:

  • 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.
  • The target file to be backed up is corrupted or inaccessible.
  • i/o device error, etc.


As we know that unfinished backup files, virus-infected files, corrupted files, and i/o device error would interfere with the Windows backup process, we can clean out the damaged files or backup with another tool to solve the problem.

Altogether, this page introduces four ways to solve your problem and restart the backup process.

Fix 1. Delete Old Backup in the Backup Location

If your computer is set to make a schedule backup, then the problem happens might because the previous backup had left unfinished. So, delete the previous backup, and remove all the existing backup files or folders to another drive, and do the backup again.

Fix 2. Full Scan the Computer with Antivirus Software

Another solution is to full scan your computer or the backup drive using antivirus software. This way is to remove malicious software and viruses from both your source disk and destination disk. After finishing the scanning process, try to create the backup again.

Fix 3. Use Another Backup Software and Check for Errors

If none of the above methods works for you, another try is to apply a third-party backup tool. Here we recommend EaseUS Todo Backup. Check its key features below:

  • Backup and restore files and folders for personal use.
  • Automatic backup protects changed data every half an hour.
  • Supports users to make scheduled backup.
  • Supports users to clone, upgrade, or transfer the system easily.

Download EaseUS Todo Backup to solve your pressing problem. It can also keep protecting your files and data in the long ride.

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Support Windows 11/10/8/7

Step 1. Click the "Select backup contents" button to start backup.

create file backup step1

Step 2. There are four data backup categories, File, Disk, OS, and Mail, click File.

create file backup step2

Step 3. Both local and network files will be listed on the left. You can expand the directory to select the files to be backed up.

File backup

Step 4. Follow the on-screen guide, select the destination where you want to save the backup.

File backup step4

Click "Options" to encrypt the backup with password in "Backup Options", set the backup schedule and choose to start back up at certain event in "Backup Scheme". There are also many other options you can explore, customize the backup task according to your need.

Backup options

Step 5. You can store the backup to local drive, EaseUS's cloud service, and NAS.

file backup step4

Step 6. EaseUS Todo Backup enables users to back up data to both third-party cloud drive and its own cloud drive.

If you want to back up data to third-party cloud drive, choose Local Drive, scroll down to add Cloud Device, add and login your account.

Backup to cloud
You can also choose EaseUS's own cloud drive. Click EaseUS Cloud, sign up with your EaseUS Account and log in.

backup to easeus cloud

Step 7. Click "Backup Now" to start backup. After the backup task is completed, it will be displayed in the form of a card on the left side of the panel. Right-click the backup task to further manage it.

File backup step7

Check for Errors:

Install EaseUS Todo Backup on the drive where you did a backup with the built-in Windows Backup and Restore program. If the 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.

Fix 4. 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.

Fix Disk Error with CHKDSK Alternative

Download EaseUS CleanGenius and install it on your computer. Let's start checking and refixing file system error on your device now.

Step 1. Click "File Showing" to enter the next step.

click file showing

Step 2. Choose the target device and tick the box of "Check and fix file system error". Click "Execute" to start fixing the problematic device.

select device and check fix file system error

Step 3. When the fixing process completes, click "here" to open and use your device. 

After fixing file system error, click to open and use device

Was This Page Helpful?

Updated by Gemma

Gemma is member of EaseUS team and has been committed to creating valuable content in fields about file recovery, partition management, and data backup etc for many years. She loves to help users solve various types of computer related issues.

Read full bio

Written by Jean

Author Jean has been writing tech articles since she was graduated from university. She has been part of the EaseUS team for over 5 years. Her special focuses are data recovery, disk partitioning, data space optimization, data backup and Mac OS. By the way, she's an aviation fan!

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Product Reviews

TrustScore 4.7 | 47 reviews
  • Taking everything into consideration, we can say that EaseUS Todo Backup Home can offer you a little extra sense of security with a set of advanced tools. The interface provides quick adaptation, every process guiding you all the way through so you don't get stuck or further damage your system rather than keeping it safe.

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  • EaseUS Todo Backup Free lets you create backups of your important files or your entire computer through its streamlined interface. Just choose the backup type you'd like to get started, and let the program do the reset.

    Read More
  • EaseUS includes all the features I expect from backup software like versioning, incremental backups, and scheduling. For more advanced users, EaseUS allows you to install a pre-boot environment onto your hard drive so you can use it to restore files without burning a CD or putting it on an external USB drive.

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