SnapshotIdentifier: [required] A unique identifier for the snapshot that you are requesting. This identifier must be unique for all snapshots within the Amazon Web Services account.
Constraints:
Cannot be null, empty, or blank
Must contain from 1 to 255 alphanumeric characters or hyphens
First character must be a letter
Cannot end with a hyphen or contain two consecutive hyphens
Example: my-snapshot-id
ClusterIdentifier: [required] The cluster identifier for which you want a snapshot.
ManualSnapshotRetentionPeriod: The number of days that a manual snapshot is retained. If the value is -1, the manual snapshot is retained indefinitely.
The value must be either -1 or an integer between 1 and 3,653.