All classes that implement StorageManagerInterface in Drupal 8
- class \Drupal\Core\Config\ExportStorageManager implements StorageManagerInterface uses StorageCopyTrait
- class \Drupal\KernelTests\Core\Config\Storage\ManagedStorageTest implements StorageManagerInterface
- class \Drupal\config_distro\DistroStorageManager implements StorageManagerInterface uses StorageCopyTrait