code: public ServiceFuture<BackupSecretResult> backupSecretAsync(String vaultBaseUrl, String secretName, final ServiceCallback<BackupSecretResult> serviceCallback) {
          return ServiceFuture.fromResponse(backupSecretWithServiceResponseAsync(vaultBaseUrl, secretName), serviceCallback);
      }
docs: Backs up the specified secret.
  Requests that a backup of the specified secret be downloaded to the client. All versions of the secret will be downloaded. This operation requires the secrets/backup permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param secretName The name of the secret.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object