A backup is a copy of a website that's kept on another hosting server and can be restored if something goes wrong with the live Internet site - an unsuccessful script update, an accidental deletion of a file or of the entire database, etcetera. Restoring the Internet site the way it was will eradicate or decrease the damage the problem may have caused, which is by all means a much better option than having to reconstruct your entire website from scratch. Although you can download a copy of your content on your personal computer, keeping a backup is a feature that the majority of hosting providers include as part of their plans. You must check out how frequently they do that, though, because some providers create a backup just once every 7 days, which may be far from enough for a booking site or an e-commerce portal where the data is updated every day. It's adviseable to see how quick and simple a backup could be restored, which could be vital if some issue appears on your site.