This blog post is the second part of a series exploring how to use Couchbase Server's high-availability features on the Google Cloud Platform (GCP), specifically focusing on Cross Data Center Replication (XDCR) between two clusters in different GCP regions to achieve high availability, disaster recovery, and geo-locality data enforcement. While the concepts are applicable to any cloud environment, the implementation details are specific to GCP. The post elaborates on Couchbase's architecture for data resiliency, including strategies for preventing data loss at various levels, such as write durability, node failure, and cloud region failures. It provides a step-by-step guide to setting up XDCR for both active/passive and active/active high-availability strategies, emphasizing the importance of backups to handle scenarios like data corruption. Additionally, it highlights the replication capabilities of Couchbase, which ensure data consistency through eventual consistency and outlines how XDCR can be part of a broader high-availability strategy for Couchbase clusters in case of data center or regional network failures.