Use DotNetZip to compress OARs and IARs.

DotNetZip provides much better compression than standard .NET.

ThirdPartyLicenses/DotNetZip-bzip2.txt

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+
+The managed BZIP2 code included in Ionic.BZip2.dll and Ionic.Zip.dll is
+modified code, based on the bzip2 code in the Apache commons compress
+library.
+
+The original BZip2 was created by Julian Seward, and is licensed under
+the BSD license.
+
+The following license applies to the Apache code:
+-----------------------------------------------------------------------
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */