EncryptionState type 
Encryption state of the Backup Vault. 
KnownEncryptionState can be used interchangeably with EncryptionState,
this enum contains the known values that the service supports.
Known values supported by the service
Enabled: CMK encryption is enabled on the Backup Vault 
Disabled: CMK encryption is disabled on the Backup Vault. User can not set this state once Encryption State is 'Enabled'. 
Inconsistent: CMK encryption is in inconsistent state on the Backup Vault. This state indicates that user needs to retry the encryption settings operation immediately to correct the state.
type EncryptionState = string