[CINDER] Snapshots export

Hi all. We have our env with Openstack (Train) and cinder with CEPH (nautilus) backend. We are creating automatic volumes snapshots and now we'd like to export them as a backup/restore plan. After exporting the snapshots we will use Acronis as backup tool. I couldn't find the right steps/commands to exports the snapshots. Any info? Cheers -- *Alfredo*