A backup is a copy of an Internet site that is kept on another server and can be restored if a problem occurs with the live website - a failed script update, an unintended deletion of a file or of the whole database, etc. Restoring the website the way it was shall eliminate or limit the damage the issue may have caused, which is by all means a much better alternative than having to reconstruct your entire site from scratch. While you may download a copy of your content on your computer, keeping a backup is a feature that nearly all hosting providers include as part of their packages. It is important to take a look at how often they do that, though, because some providers create a backup just once every week, which can be far from enough for a booking Internet site or an e-commerce portal in which the info is updated each day. You should also see how quick and simple a backup can be restored, which could be vital if some issue appears on your website.