This is probably not the best place to ask but someone might know. I am looking to backup some of my holiday photos online. I have considered using Google Documents as the storage is pretty cheap and Google have a reputation for being very secure. I am also considering other Cloud storage services like Amazon S3, Rackspace CloudFile, and GoGrid Cloud Storage. What I would like to know is if the storage at Google/Amazon/RackSpace/GoGrid fails, say a hard drive failure, what happens to my data? Is it lost forever, or does the cloud keep backups of its own data?