src/Ovh/Cloud/Cloud.php
public function postInstanceSnapshot($idInstance, $snapshotName){
        return json_decode(self::getClient()->postInstanceSnapshot($this->passport, $idInstance, $snapshotName));
    }
public function postInstanceSnapshot($idInstance, $snapshotName){
        return json_decode(self::getClient()->postInstanceSnapshot($this->passport, $idInstance, $snapshotName));
    }
POST Snapshot Instance
POST /cloud/project/{serviceName}/instance/{instanceId}/snapshot

@return