If you are tweaking the Windows 8 registry, it’s a good idea to export / backup it first!
Step By Step
Here is how you can do it:
1. Step Initiate Run by pressing the Windows Hot Key + R. Type regedit and hit enter on your keyboard to access Windows Registry.
2. Step On the left pane, go all the way up to select Computer as shown below. Once selected, click on File
3. Step You would now have the option to save the registry. Click Export to save the registry.
4. Step Now select the location where you want to save it. Make sure to save it on an external USB drive or at a safe place where you would not lose it. Save it with the following name so that you know which date was it made. Windows Reg Backup.
You have successfully created a Windows registry backup file. Make sure to keep it in a safe location.