It's worth bearing in mind the difference between durability and availability. Durability is roughly the chance of losing your data over a given time span (in t

It's worth bearing in mind the difference between durability and availability. Durability is roughly the chance of losing your data over a given time span (in this case a year), whereas availability is about how reliably you can access the data (and is almost certainly a lot lower than 11 9s). A service can be very durable but have very poor availability.