A number of today's websites rely quite a bit on external cloud services. Many websites utilize a number of external services that make up different components of the site. For example, the third-party advertising and social media controls that you integrate into your site may be hosted on cloud services. If any of the resources that your site uses crash, it can significantly hinder your site's performance and appearance or, even worse, bring your site down entirely. Amazon is a perfect example of what can happen when cloud services go bad.