A backup is a copy of an Internet site that is kept on a separate web server and could be restored if something wrong happens with the live site - an unsuccessful script update, an unintended deletion of a file or of the entire database, etcetera. Restoring the site the way it was will eradicate or minimize the damage the problem may have caused, that is by all means a much better option than having to rebuild your entire Internet site from scratch. Even though you can download a copy of your content on your PC, keeping a backup is a functionality that almost all web hosting companies include as part of their packages. It is important to check out how often they do that, though, because some providers create a backup once every 7 days, that could 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 can be crucial if some problem appears on your site.