Creates a manual snapshot of the specified cluster. The cluster must be
in the available state.
redshift_create_cluster_snapshot(SnapshotIdentifier, ClusterIdentifier,
  ManualSnapshotRetentionPeriod, Tags)[required] A unique identifier for the snapshot that you are requesting. This identifier must be unique for all snapshots within the AWS 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
[required] The cluster identifier for which you want a snapshot.
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.
The default value is -1.
A list of tag instances.
svc$create_cluster_snapshot(
  SnapshotIdentifier = "string",
  ClusterIdentifier = "string",
  ManualSnapshotRetentionPeriod = 123,
  Tags = list(
    list(
      Key = "string",
      Value = "string"
    )
  )
)
For more information about working with snapshots, go to Amazon Redshift Snapshots in the Amazon Redshift Cluster Management Guide.