1. Using FTP, copy the post.php and post-new.php to your local PC. These files are located under wp-admin directory.
2. Open the files and find the following line.
wp_enqueue_script('autosave');
3. To disable the auto save, put // before the line. This will disable the auto save functionality in WordPress
//wp_enqueue_script('autosave');
4. Save and upload back!
