If you haven't done so lately, please make a backup of the following important files before proceeding (you might need them later, even if nothing goes wrong here):
- config.php (general settings)
- *footer.php (custom footer)
- importconfig.php (import settings)
- *index.php (your home page!)
- logconfig.php (log settings)
- mapconfig.php (map settings)
- meta.php (custom meta data & scripting)
- mmconfig.php (mod manager settings)
- *css/mytngstyle.css (style sheet)
- pedconfig.php (pedigree settings)
- templateconfig.php (template settings)
- *topmenu.php (custom header)
*A note on the custom header, footer, home page and mytngstyle.css stylesheet: If you're using a template, remember that the files you'll want to back up are the ones
in the templates/template# folder (where # is the template number). If you never customized these files directly, then you don't actually need to back them up.
You might also want to back up your database tables (using Admin/Utilities), your table structure (same place), and any TNG files that you may have altered,
although the risk for data loss during this upgrade is very minimal.