diff --git a/core/lib/Drupal/Core/Config/ConfigCollectionInfo.php b/core/lib/Drupal/Core/Config/ConfigCollectionInfo.php
index 43be83e..17dfb13 100644
--- a/core/lib/Drupal/Core/Config/ConfigCollectionInfo.php
+++ b/core/lib/Drupal/Core/Config/ConfigCollectionInfo.php
@@ -41,6 +41,9 @@ public function addCollection($collection, ConfigFactoryOverrideInterface $overr
     if ($collection == StorageInterface::DEFAULT_COLLECTION) {
       throw new \InvalidArgumentException('Can not add the default collection to the ConfigCollectionInfo object');
     }
+    if ($collection == StorageInterface::ORIGINAL_COPY_COLLECTION) {
+      throw new \InvalidArgumentException('Can not add the original copy collection to the ConfigCollectionInfo object');
+    }
     $this->collections[$collection] = $override_service;
   }
 
diff --git a/core/lib/Drupal/Core/Config/ConfigInstaller.php b/core/lib/Drupal/Core/Config/ConfigInstaller.php
index 1c7993b..792316b 100644
--- a/core/lib/Drupal/Core/Config/ConfigInstaller.php
+++ b/core/lib/Drupal/Core/Config/ConfigInstaller.php
@@ -203,9 +203,16 @@ protected function createConfiguration($collection, array $config_to_install) {
       }
       else {
         $new_config = new Config($name, $this->getActiveStorages($collection), $this->eventDispatcher, $this->typedConfig);
+        // Create a copy of the original configuration for later reference.
+        if ($collection == StorageInterface::DEFAULT_COLLECTION) {
+          $config_copy = new Config($name, $this->getActiveStorages(StorageInterface::ORIGINAL_COPY_COLLECTION), $this->eventDispatcher, $this->typedConfig);
+        }
       }
       if ($data[$name] !== FALSE) {
         $new_config->setData($data[$name]);
+        if (isset($config_copy)) {
+          $config_copy->setData($data[$name])->save();
+        }
       }
       if ($config_entity_support && $entity_type = $this->configManager->getEntityTypeIdByName($name)) {
 
diff --git a/core/lib/Drupal/Core/Config/StorageInterface.php b/core/lib/Drupal/Core/Config/StorageInterface.php
index f6145b8..b9ec918 100644
--- a/core/lib/Drupal/Core/Config/StorageInterface.php
+++ b/core/lib/Drupal/Core/Config/StorageInterface.php
@@ -21,6 +21,11 @@
   const DEFAULT_COLLECTION = '';
 
   /**
+   * Collection for storing copies of original configuration.
+   */
+  const ORIGINAL_COPY_COLLECTION = 'originalcopy';
+
+  /**
    * Returns whether a configuration object exists.
    *
    * @param string $name