most artifacts are marked in metadata as pack200 unpack required
<artifact classifier='osgi.bundle' id='org.eclipse.datatools.enablement.finfo' version='1.5.1.v200906161800'>
<processing size='1'>
<step id='org.eclipse.equinox.p2.processing.Pack200Unpacker' required='true'/>
</processing>
<properties size='4'>
but there are no pack.gz as well as .blobstore and that's why:
1. mirroring from target platform repo fails, because it cannot find artefacts
2. update for eclipse platform plugins would not work