Indent backup volumes section, add basic restore info

.prettierrc

@@ -7,7 +7,7 @@
     "trailingComma": "es5",
     "overrides": [
         {
-            "files": "index.md",
+            "files": ["index.md", "administration.md"],
             "options": {
                 "tabWidth": 4
             }

docs/administration.md

@@ -50,6 +50,12 @@ Options available to bare-metal and non-docker installations:
 
 ### Restoring {#migrating-restoring}
 
+If you've backed-up Paperless-ngx using the [document exporter](#exporter),
+restoring can simply be done with the [document importer](#importer).
+
+Of course, other backup strategies require restoring any volumes, folders and database
+copies you created in the steps above.
+
 ## Updating Paperless {#updating}
 
 ### Docker Route {#docker-updating}