@Override
  public int getDSFID() {
    return PREPARE_BACKUP_REQUEST;
  }
A request to from an admin VM to all non admin members to start a backup. In the prepare phase of
the backup, the members will suspend bucket destroys to make sure buckets aren't missed during
the backup.
geode-core/src/main/java/org/apache/geode/internal/cache/backup/PrepareBackupRequest.java