Update administration docs with ansible update

docs/administration.rst

@@ -53,6 +53,9 @@ Restoring
 Updating Paperless
 ##################
 
+Docker Route
+============
+
 If a new release of paperless-ng is available, upgrading depends on how you
 installed paperless-ng in the first place. The releases are available at the
 `release page <https://github.com/jonaswinkler/paperless-ng/releases>`_.
@@ -89,8 +92,8 @@ Running `docker-compose up` will also apply any new database migrations.
 If you see everything working, press CTRL+C once to gracefully stop paperless.
 Then you can start paperless-ng with ``-d`` to have it run in the background.
 
-Updating paperless without docker
-=================================
+Bare Metal Route
+================
 
 After grabbing the new release and unpacking the contents, do the following:
 
@@ -123,6 +126,38 @@ After grabbing the new release and unpacking the contents, do the following:
     This might not actually do anything. Not every new paperless version comes with new
     database migrations.
 
+Ansible Route
+=============
+
+Most of the update process is automated when using the ansible role.
+
+1.  Backup your defined role variables file outside the paperless source-tree:
+
+    .. code:: shell-session
+
+        $ cp ansible/vars.yml ~/vars.yml.old
+
+2.  Pull the release tag you want to update to:
+
+    .. code:: shell-session
+
+        $ git fetch --all
+        $ git checkout ng-0.9.14
+
+3.  Update the role variable definitions ``ansible/vars.yml`` (where appropriate).
+
+4.  Run the ansible playbook you created created during :ref:`installation <setup-ansible>` again:
+
+    .. note::
+
+        When ansible detects that an update run is in progress, it backs up the entire ``paperlessng_directory`` to ``paperlessng_directory-TIMESTAMP``.
+        Updates can be rolled back by simply moving the timestamped folder back to the original location.
+        If the update succeeds and you want to continue using the new release, please don't forget to delete the backup folder.
+
+    .. code:: shell-session
+
+        $ ansible-playbook playbook.yml
+
 
 Management utilities
 ####################