All Tips & Tricks HQ plugins consist of two parts; code and data. What you are updating is the code. The data, containing settings and membership information, is kept in the WordPress database. Upgrading the plugin will not affect membership data.
the EXCEPTION is if you are upgrading the eStore plugin. Digital products are stored as files on your server. **IF** you stored the digital product files inside the same directory as the plugin; you must first make a backup copy of these files and then reinstall them after the upgrade. That is because upgrading plugins involves replacement of the plugin directory.
The only time you might have reason to worry about the WordPress database, is iwhen you upgrade WordPress itself.
When that occurs, your hosting provider has backup tools available, so that you can backup the WordPress database. Usually, a WordPress grade is uneventful. But for those rare occasions when something does go wrong; the database backup will save you.