Updating WordPress Tips and Techniques - WordPress manual upgrading procedures
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Now you know the important tips and techniques needed to update WordPress without problems. There are two ways you can update WordPress. The first one is time-consuming; it's called “manual updating.” The other one is easy because it uses the “automatic upgrade” feature/functionality included in the WordPress dashboard (which may not available in all versions). Bear in mind the associated risk if you update WordPress, especially if you have edited the core files before.
Classic/Manual WordPress update (not recommended if you're using a new version of WordPress):
Step 1: Back up all of your WordPress files, including your WordPress database. You can use FTP, and download all of the important files in your WordPress website. This includes the core files, theme files and the associated plug-ins. Backing up is very important; if updating causes serious problems you can revert to your backup files. Include .htaccess and robots.txt in the backup.
Step 2: If you use XAMPP, you can run your website in your local host with the WordPress and data files you have just backed up. This will verify that your backup files are working.