if (empty($instanceId)) {
     $hostname = gethostname() . '.';
     $instance = $clientHelper->getInstanceByHostname($hostname);
     $instanceId = $instance['InstanceId'];
 } else {
     $instance = $clientHelper->getInstanceById($instanceId);
 }
 $instanceName = $clientHelper->resolveInstanceName($instance);
 $console->writeLine("Creating snapshots of {$instanceName}");
 $volumes = $clientHelper->getVolumesByInstance($instanceId);
 if (count($volumes) === 0) {
     throw new Exception('No volumes found');
 }
 $toBackup = array();
 foreach ($volumes as $volume) {
     $attachment = $clientHelper->getVolumeAttachmentForInstance($volume['Attachments'], $instanceId);
     $volumeId = $attachment['VolumeId'];
     $device = $attachment['Device'];
     if (in_array($volumeId, $exclusions) || in_array($device, $exclusions)) {
         $console->writeLine("Excluding {$volumeId} on {$device}", Color::YELLOW);
     } else {
         array_push($toBackup, array('volumeId' => $volumeId, 'device' => $device));
         $console->writeLine("Found {$volumeId} on {$device}", Color::GRAY);
     }
 }
 if (!$dryRun) {
     $console->writeLine("Starting snapshots");
     $snapshotIds = array();
     foreach ($toBackup as $backup) {
         $volumeId = $backup['volumeId'];
         $device = $backup['device'];