This backs up your PuTTY settings, from the registry, to a local .reg file. You can later run the .reg to import settings to a new computer, or revert your local machine.
I use mine with Google Drive, and Windows Task Scheduler. The computer's name, and a timestamp, are stored in the filename, so it's easier to figure out which one you want.
Mine stores to Google Drive, so it should be available in case of a catastrophic drive failure.