I'm just asking this question to satisfy my curiosity on cloud development. There's one thing in common in the cloud when comes to data availability, 99.95% of data is subject to be available even during downtime. I want just to know what will happen for example if the entire region sinks in a earthquake.
I understand the fact that there's continous data backup on the cloud storages. are those storages reside in a region or not?
To give a couple of examples:
Amazon S3 is provided on a regional level. That means that when an S3 bucket is created, AWS automatically uses the different Availability Zones in that region to keep the data available.
In the catastrophic case where all the AZs in a region were to be destroyed, then that data will be lost. For that, S3 offers Cross-Region replication where objects are copied across Amazon S3 buckets in different AWS Regions.
Google Cloud Storage is a also a regional service with multi-AZ availability. Google also offers special geo-redundancy in the form of multi-regional and dual-regional Cloud Storage locations. The USA, for example is designated as a multi-region across all its data centers, while Finland and the Netherlands are a specific pair in a dual-region: