Settings
Keep Copy
When PDF Ink is done manipulating your PDF, there will be a file left behind on your server: the watermarked/stamped file. This marked file is usually stored in the wp-content/uploads/pdf-ink/ folder. Some administrators like to keep track of these files, and so they check the “keep copy” box. If this box is not checked, PDF Ink will make an attempt to delete the file. If Force downloads are turned on, this will be during “PHP Shutdown”, otherwise it is performed shortly after download by WP CRON.
Recycle Downloads
If you Keep a Copy (see above), then you can also potentially recycle a file if the same request (from the same person) is being made. This might increase disk space use, but decreases memory use, since we all know people tend to download a file over and over again.
It is wise to leave this turned OFF until you are pleased with your settings and are ready to go live. Otherwise you will not see changes you make as you play with settings. You will just see the same file delivered to you over and over again.
Delete Files
This setting allows you to set up a periodic CRON to clean up user-created PDF Ink files. Several default WP CRON schedules are permitted, including “every hour,” “daily,” “weekly” and “monthly”. CRON events can bog down a site, so we’d say avoid “every hour” unless you have a very specific purpose, beefy hosting, and know what you’re doing.
Leave No Trace
Plugins create database entries, set up CRON jobs, and often store files in the wp-content/uploads folder, and this plugin is no exception. If you know you’re never coming back (aw, we’ll miss ya!) and want to clear out your database of PDF Ink stuff, check this box, then deactivate and delete the plugin using the usual WP Plugins management page. The Uninstaller will take care of clearing out your saved settings and files. CRON jobs will always be removed, whether Leave No Trace is checked or not. Obviously, when in doubt take backups and use this checkbox with caution!