But what happens when the service you are using disappears? Then your website is gone. Almost. Try to find it on archive.org or search for it on Google and click the "Cache" link. These ways have saved countless websites but they are no guarantee.
How can such a service disappear? History have shown a company have a total system failure thus loosing the data of their paying customers, while the backup was not working. There are also countless examples of companies stopping such service with none or little notice. If you are on holiday when you get the 14 days "eviction notice", you may not get it in time.