rework backup restore options

site/source/misc-guides/attach-drive.rst

@@ -0,0 +1,33 @@
+.. _attach-drive:
+
+==========================
+Use an Existing Data Drive
+==========================
+During initial setup, select this option if you:
+  1. have re-flashed StartOS and want to resume normal operation on the same device
+  2. are transplanting your existing data drive to a new device, perhaps one with a better CPU or more RAM
+
+#. During select "Recover."
+
+    .. figure:: /_static/images/setup/screen0-recover.jpg
+        :width: 60%
+
+#. Next, select "Use Existing Drive."
+
+    .. figure:: /_static/images/setup/screen3-use_existing.jpg
+        :width: 60%
+
+#. Select your server's data drive.
+
+    .. figure:: /_static/images/setup/screen4-use_existing_drive_selection.jpg
+        :width: 60%
+
+#. Enter and confirm a new password.
+
+    .. figure:: /_static/images/setup/screen5-set_password_complete.jpg
+        :width: 60%
+
+#. Your server will initialize again (all previous data will be recovered).
+
+    .. figure:: /_static/images/setup/screen6-storage_initialize.jpg
+        :width: 60%