public com.google.type.TimeOfDayOrBuilder getStartTimeOrBuilder() {
        if (startTimeBuilder_ != null) {
          return startTimeBuilder_.getMessageOrBuilder();
        } else {
          return startTime_ == null ? com.google.type.TimeOfDay.getDefaultInstance() : startTime_;
        }
      }
<pre>
Required. The start time of every automated backup in UTC. It must be set
to the start of an hour. This field is required.
</pre>

<code>.google.type.TimeOfDay start_time = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/AutomatedBackupConfig.java