MMS is MongoDB's monitoring, backup, and management system that provides: - Server and cluster monitoring with metrics, alerts and activity feeds - Backup of replica sets and sharded clusters with initial sync and incremental backups stored as snapshots - Restore of backups to point-in-time within the last 24 hours - Automation capabilities for tasks like capacity resizing, provisioning machines, and rolling upgrades It has cloud and on-premise deployment options with pricing based on usage for the cloud version. MMS aims to simplify managing large MongoDB deployments through monitoring, backups and automation.