FEATURE: Support backup uploads/downloads directly to/from S3.

This reverts commit 3c59106bac4d79f39981bda3ff9db7786c1a78a0.

app/assets/javascripts/admin/routes/admin-backups.js.es6

@@ -151,6 +151,15 @@ export default Discourse.Route.extend({
           message: message
         })
       );
+    },
+
+    remoteUploadSuccess() {
+      Backup.find().then(backups => {
+        this.controllerFor("adminBackupsIndex").set(
+          "model",
+          backups.map(backup => Backup.create(backup))
+        );
+      });
     }
   }
 });