If you claim that the data is backed up and so on, then you are giving a garantee. Now yes, if all of amazon's datacenters burn down, or the one where ur data is, yes it will be lost, but that should be the corner case that you prepare for. Thats when you do an offsite backup in your house daily/weekly to ensure that at least there is no one place that burns down = company down the tube.
No matter the solution there is always the probability that shit will happen to all of it.
However if you are selling a reliable service, don't sell an unreliable reliable service. Reliable should mean that at least you back it up so that if one hard drive rack blows up, the data is not gone.
They didn't say it was bulletproof. They stated that data was replicated to more than one device to ensure that a single component failure would not result in data loss.
They didn't say it was bulletproof or impossible to loose data. They explain fairly well how things work, what the failure rates are, and give you the tools to do the same risk analysis and cost/benefit calculations you would do anyway, whether using a cloud service or rolling your own.
Multiple equipment failure can happen. Even across data centers and availability zones. The larger the entire AWS system gets, the higher the chances of eventually seeing edge cases where the wrong equipment at just the wrong time screws up to lose data.
If you want bulletproof data storage system that has such a rediculously low failure rate that you are guaranteed not to loose data for a hundred years, you can get it - but it's going to cost a heck of a lot more than anything Amazon is selling you.
Either you are reliable or not.
If you claim that the data is backed up and so on, then you are giving a garantee. Now yes, if all of amazon's datacenters burn down, or the one where ur data is, yes it will be lost, but that should be the corner case that you prepare for. Thats when you do an offsite backup in your house daily/weekly to ensure that at least there is no one place that burns down = company down the tube.
No matter the solution there is always the probability that shit will happen to all of it.
However if you are selling a reliable service, don't sell an unreliable reliable service. Reliable should mean that at least you back it up so that if one hard drive rack blows up, the data is not gone.