The claim is that some of the data was migrated to publicly available systems. I'm guessing that quite a bit of it is stored in amazon specific systems, for two reasons. First, availability. If the amazon product catalog depends on Aurora, then when Aurora has an issue, so does Amazon retail. Second, custom solutions that were developed before modern alternatives existed have an insurmountable inertia in a big company.
No, not at all, but it rarely goes down at the same time. I mean, I could be wrong, but that's my read of the announcement. Another issue with the managed services is that they don't provide total control over configuration, which is a complete show stopper for a large high performance data store.
