When you manage a website, having a backup is something quite essential, especially if you have important data or you have invested money and time in creating the website. There are various scenarios why you may need a backup - if you update a script and something goes completely wrong, if you erase a file or an entire folder by mistake, and so forth. Having regular backups will help you avoid any loss of information or at least minimize the damage, which is still better than losing the entire site. You may download a copy of your content on your personal computer occasionally, but because you simply can't do that after every single change, you must rely on the backups which your web hosting provider generates. As this is something really crucial, you have to make sure that they keep up-to-date backups, considering that a backup created once every one or two weeks won't do any good when you run a site such as an online store or a holiday accommodation reservations website.