Comment 3 for bug 1567263

Example:
After devstack install we have a default volume-type
stack@debian:~$ cinder type-list
+--------------------------------------+-------------+-------------+-----------+
| ID | Name | Description | Is_Public |
+--------------------------------------+-------------+-------------+-----------+
| 73dba26b-9e1a-4203-a622-4fd5527ac704 | lvmdriver-1 | - | True |
+--------------------------------------+-------------+-------------+-----------+

-----> in this case restore encrypted volume wont work.
Once we delete the volume-type and create encrypted volume type - restore backup works