A backup is a copy of a site which is kept on an independent server and could be restored if something wrong happens with the live Internet site - a failed script update, an unintentional deletion of a file or of the whole database, and so forth. Restoring the Internet site the way it was will take away or reduce the damage the problem may have caused, which is by all means a certainly better option than having to rebuild your entire site from scratch. Even though you could download a copy of your content on your computer, keeping a backup is a feature that almost all hosting providers incorporate as part of their packages. It is important to take a look at how frequently they do that, though, because some providers generate a backup just once every week, that could be far from enough for a booking Internet site or an e-commerce portal in which the data is updated every single day. It's adviseable to see how quick and easy a backup may be restored, which can be essential if some problem appears on your site.