* In case the hard drive of your server machine fails due to any reason.
* Web hosting backups is necessary in case you delete all your data accidentally, or if the database gets infected by any virus.
* Often many people ignore the necessity of keeping a backup of their server hard drive while reloading an operation system.
* Web hosting backups are absolutely essential if you are using a shared server. There are many instances where a single account of a shared hosting server has crashed the entire server.
* Keeping backups for web hosting are also essential if you are planning to change your web hosting service provider.