A backup is a copy of a site which is kept on a separate web server and can be restored if a problem occurs with the live Internet site - a failed script update, an unintended deletion of some file or of your whole database, and so forth. Restoring the Internet site the way it was will eliminate or minimize the damage the problem may have caused, that is by all means an obviously better alternative than having to reconstruct your whole website from scratch. While you could download a copy of your content on your personal computer, keeping a backup is a feature that the majority of web hosting companies incorporate as part of their packages. It is important to check out how frequently they do that, though, because some companies create a backup only once every week, which might be far from enough for a booking website or an e-commerce portal in which the information is updated every day. You should also see how quick and simple a backup may be restored, which can be vital if some issue appears on your Internet site.