Most web servers often do have a backup of your website, but not all of them. Even if they do, what if the hosting server fails? The site and backup could both vanish at the same time. Your data isn’t safe unless you’re backing up properly and with redundancy. It is best to have a backup in a different location as well.
Watts Web Studio keeps an original backup of the files for websites that we developed in case they’re ever needed. That is a great first step, but if the website is updated often, to be safe you will likely need regular backups so as to not loose the progress you’ve made over time. For added peace of mind and security, scheduling a regular backup service can be discussed for your website.