What are regions and Availability Zones (AZs)

A region is a geographic area where Volume Backup Service (VBS) works. Availability Zones (AZs) in the same region can communicate with each other through the intranet, but those in different regions cannot.
Each region contains many AZs where power resources and networks are physically isolated. AZs in the same region can communicate with each other over the intranet, but those in different regions cannot. Each AZ provides cost-effective and low-latency network connections that are unaffected by faults which may occur in other AZs. Therefore, deploying VBS in separate AZs protects your applications against local faults that occur in a specific location.

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