It is important to keep a local copy of your website in case that something unexpected happen.
To create a backup of your PrestaShop store you need to copy both the files and the database associated with it.
You can find more information on how to download a copy of the application’s files here.
The instructions for exporting a database are available in this article.
Once the files are downloaded on your computer keep them in an easy accessible folder and if there is some issue you can quickly deploy them to your PrestaShop Hosting account and restore the website in its working condition.