And thousands of other books like that.
> designed to provide 99.999999999% durability of objects over a given year. This durability level corresponds to an average annual expected loss of 0.000000001% of objects. For example, if you store 10,000,000 objects with Amazon S3, you can on average expect to incur a loss of a single object once every 10,000 years
They are referring to durability as corruption in the underlying data store due to known storage-technology risks. If they were to take into account all other risks, they would also have to include the risks of nuclear war, cyber warfare, the US government classifying your organization as a terrorist threat, etc etc.
I'm not supporting the old deprecation policy, in fact I thought it was insane. But if anyone publishes a URL assuming that it won't disappear they've not been paying attention. If the peace corps just migrated to Azure instead the links would also die.
It's very likely that there would be something that replaces URLs in the future.
Amazon promise seems to be that they will always keep your data integrity and keep it accessible. The way I see is that they will be moving my data to newer or better storage types and will keep my data unchanged regardless of any technology change.
To keep with the analogy, Amazon's promise here is that they will always keep the data that you originally stored in your floppy disk, but they cannot promise to give it back to you in a floppy disk. Next year they might give it back to you in a CD and the year after in a cartridge.
The data has been always there, intact. They are just giving it to you in a different medium.