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There was a bug regarding the launch of a snapshot of a volume backed instance: https://bugs.launchpad.net/horizon/+bug/1374931

One comment says

Per the discussion in gerrit, the zero-byte snapshot is normal from nova/glance, as it reflects the fact that no space is being taken in glance, since the volume snapshots are stored in cinder.

Depending on your storage backend you could retrieve that image, e.g. if you are using Ceph you could export the respective image with rbd commands. Ii seems there is currently no way to download a volume backed snapshot except with some workarounds, I may be wrong though.