Making a backup is a routine job of a website owner. You need to regularly backup your website to avoid unexpected incidents. From server crash, misconfiguration, and so on. Making a backup of a WordPress site is actually easy. You just need to copy all files under the root directory and export your database (which you can do via PhpMyAdmin). To make your life easier, you can use a backup plugin to assist you in backing up your website regularly. UpdraftPlus is one of the backup plugins that you can use to do. The plugin — which has over 3 million active installations according to a stat on WordPress.org — allows you to back up your website more effortlessly. You can send the backup files to your popular cloud storage services like Dropbox, Google Drive, OneDrive, Amazon S3, and so on.
Updraft is released as a freemium plugin. Meaning that you can use it for free. But to get the most out of the plugin, you better use the pro version as the pro version comes with more advanced features like incremental backups (only backup changes to your files that have been made to your site since the last website. Great to save storage space), migration tool, backup scheduling, WP-CLI support, more database backup options, the ability to send backup to multiple locations, and so on.