Is it possible to use two different regions for two data centers?
The complete fault-tolerant configuration scheme looks like in the picture below, where one region (data center) is active, and the second is passive.
Data is exchanged between regions through replication and backup.
Each data center has an internal fail-safe configuration.
In the cloud infrastructure, it is possible to use a combined option, where a fault-tolerant configuration is built between the two regions, the main thing is to provide sufficient bandwidth for data exchange: