Is it necessary to backup S3?
brk: You can put all the marketing spin on it that you want, but S3 is still just another webapp.  Architected by humans, operated by humans.If you think the humans at Amazon are somehow above making mistakes or bad decisions, then there is no need to backup your data.If you don't fully trust the humans at Amazon, and what to be able to have access to your data, on your terms, at any time, you should back it up...