Last Updated on June 4, 2026
As more and more of our lives are being stored on things such as our computers and smartphones, it makes sense that you would want to make sure that your data is secured in case of some type of theft or hardware failure that would normally leave you without your important personal files.
For this reason, it’s important to make sure that you create regular backups of your important files so you always have a current backup in place that can be quickly restored if needed. When most people think of backups, they usually think of file level backups which only backup your files and the folders that they are contained in. Doing this type of backup is always a good idea and should be done on a regular basis. But there is another type of backup you might want to consider doing called a system image backup. In this article, we will be showing you how to create and restore Windows OS system image backups.
OS system image backups will backup the entire drive on the computer including the operating system (Windows) as well as any programs/applications as well as your personal files and folders. This is different from cloning a hard drive which makes an exact copy of that hard drive on another drive. System image backups usually create their own type of image file or multiple files that contain the contents of your computer.
This backup is created on a different hard drive than the one containing Windows and your apps. Then if your computer has a catastrophic failure like Windows corruption or a virus, you can restore your entire computer back to the date and time that the system image backup was created. But you do need to keep in mind that the backup will only be as current as the date it was made. So, if you restore a system image backup that is 6 months old, your computer will be reverted back to that date and any changes made since then will be lost. This is where doing file level backups come into play because you can then restore your personal files from a current backup once the system image backup has been restored.
There are many backup programs you can use for file level backups as well as system image backups. The one we will be using for our demonstration is called Rescuezilla and can be downloaded from their website here. The software comes in an ISO (International Organization for Standardization) format.
To use the Rescuezilla software, you will need to create a bootable USB flash drive or CD\DVD if you still have a CD burner in your computer. There are plenty of USB media creation tools that you can use for free such as Rufus to create your bootable flash drive.
Creating a Windows OS System Image Backup
1. Prepare Your Destination Drive
In order to completely create a Windows OS system image, you will definitively need to have another large hard drive ready. This extra external drive will securely store the massive image file itself. This drive will absolutely need to be physically connected and accessible from your computer while running the Rescuezilla bootable environment. You should easily be able to use an internal secondary drive or an external USB hard drive for your main backup location.
2. Boot into Rescuezilla
When you first load the Rescuezilla flash drive, you will instantly see a rapid countdown menu. You will have exactly 10 seconds to either change the core language from the default setting or press a key on your keyboard to stop the countdown timer. Select your preferred language to immediately move to the next screen.
3. Ignore the UEFI Warning Message
If your computer uses a modern UEFI rather than a legacy BIOS, you may get a strange error message. The screen will display text that specifically says EFI stub: Warning failed to measure data for event 1. This is nothing to worry about at all. You can just wait a minute or two and the error message should go away completely on its own.
4. Select the Backup Operation
You will then clearly see the main Rescuezilla graphical screen appear on your monitor. You will definitively want to choose the large Backup option on the left side of the interface. Click the Next button located directly in the bottom right corner to proceed.
5. Choose the Windows Source Drive
Rescuezilla will then actively try to locate and mount all your attached hard drives. You will need to select the specific drive that actually contains your live Windows installation. Click the Next button after highlighting it in blue. It should be the very first drive in the list unless your physical disks are wired in a non-typical order. The correct drive should also explicitly say Windows boot Manager directly next to it.
6. Verify Your OS Partitions
You will then be clearly shown all the physical partitions residing on that specific drive. They should all be checked and selected by absolute default. You can simply leave it exactly like this. The only exception is if you have some extra storage partition on that same drive that is completely unused by Windows that you specifically want to exclude.
7. Pick the Destination Drive
Next, you will need to actively select the physical drive where you want the backup image to be securely written and stored. Just be absolutely sure this target hard drive has enough free space to comfortably hold a complete backup of your entire OS drive. The final size of the backup will definitely be smaller than the raw space used on the source drive. The final file size can still be quite large depending on your total installed programs.
8. Select the Destination Folder
You will then be able to easily choose a specific folder on your backup drive. This tells Rescuezilla exactly where you want the final backup image to be dumped. You can simply click the Browse button on the right side to manually navigate to the proper directory location.
9. Create a New Backup Directory
There is a handy folder button at the extreme upper right corner of the screen inside the file browser. You can click this specific icon to create a brand new folder to keep things completely organized. If you have any other previous system image backups already inside this folder, they will be prominently shown here in a list as well.
10. Name Your New Backup Image
On the very next screen, you will be able to give your backup a highly specific custom name. This makes it significantly easier to differentiate between any other older backups you might have sitting on the drive. It is highly recommended to include the current date in the file name itself to prevent confusion.
11. Configure the Compression Level
The next step involves manually choosing a compression method and level. You can absolutely just go with the standard default settings if you prefer. You have advanced graphical options to use gzip, zstandard, bzip2 or keep the backup completely uncompressed. Higher compression levels definitely make for much longer backup times but drastically smaller backup file sizes.
12. Review the Backup Summary
You will then be immediately shown a complete summary screen for the entire backup job. Look over the source and destination paths very carefully. If everything looks absolutely correct, you can click on the Next button to officially start the system image backup creation process.
13. Wait for the Backup Process
How long this complete backup process will actually take will depend entirely on how much raw data is on your hard drive and its overall read speed. You will see a blue progress bar actively tracking the current percentage in real time. Once the entire backup process is successfully complete, you can then click the Next button to be taken back to the main Rescuezilla menu.
14. Reboot the Computer
You can then click on the small monitor icon located at the extreme lower left corner of the main screen. This simple menu click will get you directly to the standard shutdown and reboot options. You can then safely boot back into Windows. You can browse your external drive through File Explorer to verify the new backup file exists if desired.
Restoring a Windows OS System Image Backup
1. Boot Rescuezilla for Restoration
If there ever comes a terrible time when you actually need to restore your computer using one of your system image backups, do not panic. You will quickly find that the total restoration process is very similar to the exact process you performed to make the backup initially. Once again, you will absolutely need to boot to your Rescuezilla USB media. This time you will choose the red Restore option from the main menu.
2. Locate Your Backup Image Drive
Next, you will need to accurately select the physical external drive that has your system image backup stored safely on it. Highlight the proper disk in the provided menu list so it turns blue. Click the Next button located at the bottom right corner to continue.
3. Browse for the Specific File
Now you will be perfectly able to browse directly to the folder location where the backup file is physically located. Use the graphical file explorer window to dig deep into your backup directories. Select the exact target file once you locate it.
4. Verify the Chosen Image
You will then be explicitly shown all the valid backups that are currently contained inside that specific folder. If you are actively using one single massive folder for all your chronological backups, pay close attention right here. You will need to make absolutely sure to highlight and choose the correct file based entirely on the date and name.
5. Select the Target Windows Drive
The next critical step involves selecting the physical drive to aggressively restore the backup image onto. This should be your primary local Windows drive. You are about to permanently overwrite your current corrupted Windows installation completely with the perfect one from the system image backup file.
6. Choose the Correct Partitions
You will then be explicitly asked to choose which precise partitions you want to safely restore to the drive. You will most likely want to select all of them to absolutely guarantee a bootable system environment. They should all be conveniently selected by default on this screen.
7. Confirm the Restore Settings
You will then be immediately shown a final summary screen of what is exactly about to be forcefully restored. Read this block of text extremely carefully to thoroughly avoid destroying the wrong drive. If everything looks absolutely correct, you can click the Next button to finally move forward.
8. Accept the Overwrite Warning
You will then be shown a highly visible warning box telling you that all the existing data will be permanently overwritten on the drive. This destructive action cannot be easily undone. If you have any remaining files on this target drive that you urgently need to backup, you should absolutely cancel and do this before starting the restore process.
9. Wait for the Restoration
You will then see the active restore progress screen immediately appear on your monitor. You will need to wait patiently until the block copying process is completely finished. Reboot your computer naturally once the prompt appears to make absolutely sure the system image restore process was completely successful.
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