The guide outlines the steps for migrating self-managed Couchbase Server clusters to Couchbase Capella Database-as-a-Service (DBaaS). The process involves several key steps, including preparing for migration, deploying and configuring a cluster on Capella, creating database credentials users, recording cluster connection endpoints, adding IP addresses as allowed IPs, and verifying the migration. The guide also covers using the `cbbackupmgr` CLI tool to create backups of self-managed Couchbase Server buckets, restoring the backups to Capella, and building indexes on Capella. Additionally, it discusses the use of Cross Data Center Replication (XDCR) for ongoing data replication between clusters.