Your Joomla site may have a front-end My Account page that your users can use to update their own email addresses. However, occasionally you may wish to manually update a user's email address on their behalf; you can easily do so in the Joomla Administration area.
It's no secret that people often forget their online passwords. Although Joomla login pages and modules usually have a "Forgot Password?" link, occasionally you may wish to manually change someone's password. You can easily do so in the Joomla Administration area.
It's important to back up your Joomla website frequently, and Akeeba Backup makes the process painless. I strongly suggest at backing up at least once per week, more often if you update your site more frequently.