If you manage a website, having a backup is something quite important, particularly if you have important data or you have invested money and time in creating the site. There are different situations why you may require a backup - if you update a script and something goes wrong, if you delete a file or a whole folder by accident, 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 computer system every now and then, but as you cannot do that after every change, you'll have to rely on the backups which your host company generates. As this is something extremely crucial, you must make certain that they keep up-to-date backups, considering that a backup created once every one or two weeks might not do any good when you run a site such as an online store or an accommodation booking portal.