How to backup and restore the registry in Win10 preview

Changing some settings by modifying the registry is often done in Win10, such as unlocking the new Win10 clock application. Every time you modify the registry, it is recommended to back up the registry so that you can restore the registry in time after a problem occurs. How to backup the registry in Win10? How to restore the registry?
Back up the entire registry
Open the Registry Editor, select the root computer & rdquo; in the list on the left, and then click the “file” menu, select “export”. Figure:

Then the "Export Registry File" dialog box will pop up. Figure:

Select the save location, enter the file name, click the "Save" button to back up the registry as a reg file.
There is also a way to back up an item in the "Export Registry File" window to "export scope" & rdquo; select & ldquo; all & rdquo; can also back up the entire registry.
Backup of an item in the registry (a branch)
But the registry is very large, and you only modify the items, so there is usually no need to back up the entire registry, just back up the one you modified. Items can be.
Select the items to be backed up in the Registry Editor, right click on the item and select “Export”. As shown in the figure:

The same will pop up "Export Registry File" dialog box. Figure: