ZFS replication is a critical process for ensuring efficient backups and failover readiness by leveraging snapshots and optimized data transfer. This guide explores ZFS replication strategies, tools, configurations, and key features such as compression, encryption, and snapshot management. Key points include the comparison between push and pull replication methods, transfer steps using tools like Syncoid, and advanced features like bandwidth limiting and logging. The guide also covers connection methods, security implications, and best practices for configuration, helping users choose the right tool for their needs. Additionally, it discusses snapshot management, including the use of holds and bookmarks, and provides insights into resuming interrupted transfers and optimizing performance.