Links to migration guide

docs/backdrop/index.md

@@ -5,9 +5,13 @@
     1. [Install Backdrop](https://backdropcms.org/installation), and...
     1. [Review the CiviCRM requirements](../general/requirements.md)
 
+???+ tldr "Migrating from Drupal 7"?
+
+    If you are migrating to Backdrop from Drupal 7, see [Switch from Drupal to Backdrop](https://docs.civicrm.org/sysadmin/en/latest/misc/switching-cms/drupal-to-backdrop/) in the [System Administrator Guide](https://docs.civicrm.org/sysadmin/en/latest).
+
 ??? tldr "Alternative: Civibuild for developers"
 
-    If you plan to develop patches for CiviCRM on WordPress, then please read the [Developer Guide](https://docs.civicrm.org/dev/en/latest) for information about [Buildkit](https://docs.civicrm.org/dev/en/latest/tools/buildkit/) and [civibuild](https://docs.civicrm.org/dev/en/latest/tools/civibuild/).
+    If you plan to develop patches for CiviCRM on Backdrop, then please read the [Developer Guide](https://docs.civicrm.org/dev/en/latest) for information about [Buildkit](https://docs.civicrm.org/dev/en/latest/tools/buildkit/) and [civibuild](https://docs.civicrm.org/dev/en/latest/tools/civibuild/).
 
 <a name="directory"></a><!-- old anchor -->
 ## Get the code {:#download}
@@ -158,9 +162,9 @@ There should now be a **CiviCRM** link in your Backdrop menu. Click that link an
 
 If your MySQL database is hosted on a different machine than your web server, or if your host requires it, you can use TLS to encrypt the connection between the database and the web server.
 
-Full instructions on installing drupal are out of scope for this guide, but one method is to install into a test database first without MySQL encryption and then move the database to the live server and update settings.php to enable MySQL encryption.
+Full instructions on installing Backdrop are out of scope for this guide, but one method is to install into a test database first without MySQL encryption and then move the database to the live server and update settings.php to enable MySQL encryption.
 
-See [TLS for MySQL](../general/mysql_tls.md) for introductory concepts and the settings for the CiviCRM database. For the Drupal database you have several options for updating settings.php:
+See [TLS for MySQL](../general/mysql_tls.md) for introductory concepts and the settings for the CiviCRM database. For the Backdrop database you have several options for updating settings.php:
 
 1. The simplest, which doesn't require a client certificate, but doesn't verify the server certificate.
 
@@ -170,7 +174,7 @@ See [TLS for MySQL](../general/mysql_tls.md) for introductory concepts and the s
       array (
         'default' =>
         array (
-          'database' => 'drupal',
+          'database' => 'backdrop',
           'username' => 'dbuser',
           'password' => 'dbpassword',
           'host' => 'db435.examplehost.com',