Perform the following steps to restore your customize
DITA templates from an existing backup:
In the main menu, click Structure > DITA > Customize
DITA > Restore Customizations.
In the Restore Options dialog, select the location where
your custom DITA configurations are available. You can choose from
the Program Folder or any Other Folder location.
Click OK to restore your customized
DITA templates from the backed up location.