Backup Your Website
Very often user backup their data. But it’s more important when you desperately need that but you can’t get it. It’s like an insurance policy. You're all hard work can be erased in the blink of an eye. You don’t want to be in that situation. We don’t need very often but the day you do, you’ll thank yourself.
Keep Your Files Up to Date
WordPress comes with the built-in option which updates WordPress core, plugins and themes. You should use the latest version and keep all your plugin and theme updated. This update reduces the chances of your file being affected.
There is few situation when the files are outdated. Like when premium plugin or theme’s license expired and it failed to check for an update.