<p>Have you tried a HB-29? It is a petal type (for the VR1) but it is deeper and bigger than what comes with the VR2 as standard. And its a bayonet fit not screwed into the filter thread.</p>
Shun in your back up workflow don't you delete the
shots that are clearly bad (out of focus etc)? If you have
a laptop sorting shouldn't be an issue and you would
save some space (considerably, when shooting at high frame rates).