diff --git a/manifests/app_type.pp b/manifests/app_type.pp
index 5e8f6a2..3ef7a6c 100644
--- a/manifests/app_type.pp
+++ b/manifests/app_type.pp
@@ -88,9 +88,14 @@ define sunetdrive::app_type (
   $drive_email_template_text_left = $config['drive_email_template_text_left']
   $drive_email_template_plain_text_left = $config['drive_email_template_plain_text_left']
   $drive_email_template_url_left = $config['drive_email_template_url_left']
+  $full_backup_retention = hiera('full_backup_retention')
   $lb_servers = hiera_hash($environment)['lb_servers']
   $document_servers = hiera_hash($environment)['document_servers']
 
+  # Calculate some values
+  $expiration_days_min = $full_backup_retention * 31
+  $expiration_days_max = $full_backup_retention * 31 + 93
+
   unless $is_multinode{
     user { 'www-data': ensure => present, system => true }
 
diff --git a/templates/application/config.php.erb b/templates/application/config.php.erb
index ec36ad8..23080bc 100644
--- a/templates/application/config.php.erb
+++ b/templates/application/config.php.erb
@@ -192,6 +192,9 @@ $CONFIG = array (
   'secret' => '<%= @secret %>',
   'skeletondirectory' => '<%= @skeletondirectory %>',
   'templatedirectory' => '',
+<% if @environment == 'test' -%>
+  'trashbin_retention_obligation' => 'auto, 30',
+<% end -%>
   'trusted_domains' =>
     array (
     <%- index = 0 -%>
@@ -234,4 +237,7 @@ $CONFIG = array (
     ),
   'updatechecker' => false,
   'version' => '<%= @nextcloud_version_string %>',
+<% if @environment == 'test' -%>
+  'versions_retention_obligation' => '<%= @expiration_days_min %>,<%= @expiration_days_max %>',
+<% end -%>
 );