Support for removal of old backups automatically via a site setting

app/controllers/admin/backups_controller.rb

@@ -49,9 +49,13 @@ class Admin::BackupsController < Admin::AdminController
   end
 
   def destroy
-    filename = params.fetch(:id)
-    Backup.remove(filename)
-    render nothing: true
+    backup = Backup[params.fetch(:id)]
+    if backup
+      backup.remove
+      render nothing: true
+    else
+      render nothing: true, status: 404
+    end
   end
 
   def logs