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For backing up your Windows registry before using a registry cleaner, simple open Run, input "regedit", and your registry will pop up. Click "File", and select "Export", then you can backup your registry file to any location on your computer.

But actually you don't have to do that. Most well-designed registry cleaner & optmizer has the function for automatic backup. That backup, is to backup the registry repair. If any problems happen after the registry change, then you can undo the change with the backup.

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