Downloading snapshot
Check the image ID of the snapshot
Run
openstack image save --file <file-name> <image-id>
#example
$ openstack image save --file snapshot.raw 0258526c-f523-4645-8a9d-f6980ad87864
Check the image ID of the snapshot
Run
openstack image save --file <file-name> <image-id>
#example
$ openstack image save --file snapshot.raw 0258526c-f523-4645-8a9d-f6980ad87864