I’ve never used Plex, but I’ve been interested in it for managing videos. It’s a PVR on which you store and organize ripped video or movie files, separate from the Tablo. The Tablo does not connect to it. The Tablo would be 1 source of video files that you’d load onto the Plex storage/database. Look up a YouTube video on Plex for more info, or check out this link.
The ripper depends on which device you’re using. A link to the Gen4 Tablo Desktop Player info, which can also rip Tablo Gen4 programs, can be found here.