Compressed backups reduce the size of the backup files, which in turn minimizes storage requirements. This is especially useful for large databases or when storing backups on external or cloud storage.

In synchronous replication, the primary server waits for all replicas to confirm that they have successfully applied the changes before committing the transaction. This ensures consistency across the primary and replicas but can add latency.

The innodb_buffer_pool_size parameter in the my.cnf file specifies the size of the buffer pool in MySQL. A larger buffer pool size can improve performance by reducing disk I/O.

MySQL Enterprise Backup supports encrypted backups, ensuring that sensitive data is protected during the backup process. This feature is essential for securing backups, especially when they are stored offsite or in the cloud.

The InnoDB undo log stores uncommitted changes, allowing transactions to be rolled back if necessary. This ensures consistency and atomicity in the transaction lifecycle.