@java.lang.Override
  public final boolean isInitialized() {
    byte isInitialized = memoizedIsInitialized;
    if (isInitialized == 1) return true;
    if (isInitialized == 0) return false;

    memoizedIsInitialized = 1;
    return true;
  }
<pre>
Optional. The id of the backup to be created. If not specified, the
default value ([YYYYMMDDHHMMSS]_[Shortened Instance UID] is used.
</pre>

<code>optional string backup_id = 3 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for backupId.
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/BackupInstanceRequest.java