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Durable Reduced Availability (DRA) Storage is like Standard Storage but with lower performance and availability. DRA Storage has a 99 percent availability, while Standard Storage has greater than 99.99 percent availability in dual-regions and multiregions and 99.99 percent in regions.

The documentation for Durable Reduced Ability Storage, Multi-Regional Storage, and Regional Storage states that “[u]nless you already are using one of these additional classes, you should use Standard Storage instead.” (Source: cloud.google.com/storage/docs/storage-classes)