A backup is a copy of a site which is kept on a different web server and could be restored if something wrong happens with the live Internet site - a defeated script update, an unintended deletion of some file or of the entire database, and so on. Restoring the Internet site the way it was will remove or reduce the damage the issue may have caused, which is by all means an obviously better alternative than having to reconstruct your entire site from scratch. Even though you may download a copy of your content on your personal computer, keeping a backup is a function that nearly all website hosting companies offer as part of their plans. It's important to check how frequently they do that, though, because some companies generate a backup once every few days, which may be far from enough for a booking site or an e-commerce portal in which the information is updated every single day. It's adviseable to see how quick and simple a backup can be restored, which could be essential if some problem appears on your site.
