How to back up the Registry using System Restore
The fastest and easiest way to back up your Registry is to create a System Restore point before you make any changes that you can use to roll back your machine to a happier time if necessary.
How to back up the entire Registry in a reg file
The Registry follows the same hierarchal folder system as the rest of your PC, it’s just displayed differently. Here’s how to back up the entire Registry in a single reg file. This will create a copy of all the settings in your Registry, so if something goes wrong, you can double-click this file to import these settings into your live Registry. There will be some entries that the Registry will not be able to alter because they will be running. While this method of backup is good to have in an emergency, the restore point is a much more comprehensive solution.