backup: Prevent snapshots and checkpoints at same time
Earlier patches mentioned that the initial implementation will prevent snapshots and checkpoints from being used on the same domain at once. However, the actual restriction is done in this separate patch to make it easier to lift that restriction via a revert, when we are finally ready to tackle that integration in the future.
Signed-off-by: Eric Blake <eblake redhat com> Reviewed-by: Daniel P. Berrangé <berrange redhat com>
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