1.) Replication is the process of copying and maintaining database objects, like data, in multiple locations. It ensures data consistency and availability across different systems. 2.) How Does VSS Work in a Backup Scenario? Volume Shadow Copy Service (VSS) is a Windows feature that allows for creating snapshots of computer files or volumes, even when they are in use. In a backup scenario, VSS works as follows: 1. Initiation: A backup application requests a snapshot of a volume. 2. Preparation: VSS temporarily pauses I/O operations on the volume to ensure data consistency. 3. Snapshot Creation: VSS creates a point-in-time copy (shadow copy) of the volume. 4. Backup Execution: The backup software reads the shadow copy without affecting the running applications. 5. Completion: Once the backup is finished, VSS resumes normal I/O operations. 3.) What’s a Snapshot? A snapshot is a point-in-time copy of a system's data. It captures the state of a file system or volume at a specific moment, allowing for: 1. Data Protection: Protects against data loss by providing a recoverable version. 2. Quick Recovery: Allows for fast restoration of data without needing a full backup. 3. Testing and Development: Enables safe testing of changes without impacting the live environment. Snapshots can be created manually or automatically, depending on the system's configuration.