public static void send(Set recipients, PartitionedRegion r, int bucketId) {
    Assert.assertTrue(recipients != null, "BucketBackupMessage NULL sender list");
    BucketBackupMessage m = new BucketBackupMessage(recipients, r.getPRId(), bucketId);
    m.setTransactionDistributed(r.getCache().getTxManager().isDistributed());
    r.getDistributionManager().putOutgoing(m);
  }
Sends a BucketBackupMessage requesting that another VM backup an existing bucket

@param recipients the member that the contains keys/value message is sent to
@param r the PartitionedRegion that contains the bucket
geode-core/src/main/java/org/apache/geode/internal/cache/partitioned/BucketBackupMessage.java