@java.lang.Override
    public long getBytesCopiedToSink() {
      return bytesCopiedToSink_;
    }
<pre>
Bytes that are copied to the data sink.
</pre>

<code>int64 bytes_copied_to_sink = 8;</code>

@return The bytesCopiedToSink.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java