@Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    super.fromData(in, context);
    properties = DataSerializer.readProperties(in);
  }
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