A backup is a copy of a website that's kept on an independent web server and can be restored if something wrong happens with the live site - an unsuccessful script update, an unintentional deletion of a file or of your whole database, and so on. Restoring the Internet site the way it was will eliminate or reduce the damage the problem may have caused, that is by all means a lot better option than having to rebuild your entire website from scratch. Even though you could download a copy of your content on your computer, keeping a backup is a functionality that the majority of hosting companies offer as part of their plans. It's important to check out how often they do that, though, because some service providers generate a backup once every couple of days, that could be far from enough for a booking site or an e-commerce portal in which the info is updated each day. It's adviseable to see how easily a backup could be restored, which can be vital if some problem appears on your website.