All user-added exclusions are stored in the registry under the "HKEY_CURRENT_USER\Software\KsL Software\RegHealer" key.
To save user-defined exclusions you should save the above registry key into a file.
To do so, run regedit.exe, navigate to "HKEY_CURRENT_USER\Software\KsL Software\\RegHealer" key, select the "Registry" top menu, then "Export Registry File..".
Select a file name to save and click "Save".
To import settings back to the registry simply double click on the file. File should have .reg extension.