public Builder addBackupFiles(
        int index, com.google.cloud.memorystore.v1.BackupFile.Builder builderForValue) {
      if (backupFilesBuilder_ == null) {
        ensureBackupFilesIsMutable();
        backupFiles_.add(index, builderForValue.build());
        onChanged();
      } else {
        backupFilesBuilder_.addMessage(index, builderForValue.build());
      }
      return this;
    }
<pre>
Output only. List of backup files of the backup.
</pre>

<code>
repeated .google.cloud.memorystore.v1.BackupFile backup_files = 8 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/Backup.java