Thanks David S for showing me where. I'm surprised this feature isn't enabled by default.
Dislike that, if it still takes up disk-space, then why not still have it avail in Plex?
It moves your "finished" material into a separate physical bucket that can be moved to another hard drive or storage medium for archival or permanently deleted. Weeding through the larger library for these items later is tedious.
And how would that work in a multi-user environtment?
Adding a "keep this until I delete" flag on selected content content to override the policy (this is how my cable DVR works). Archiving also gives users a chance to "undelete" before it's permanently deleted from disk.
Brainstorming further: The goal I have here is to keep the main content menus fresh - especially TV shows, movies to some extent (not so much for music) where there's massive churn. Most people don't care about every single episode of most TV shows that's ever been downloaded. Some folks do, I know.
Maybe the term "delete" isn't ideal - "expiration" could be more appropriate -
Expire content:
[ n ] days after watching
[ n ] days after download
[ checkbox] never expire content
Expired content is
[ checkbox ] archived / moved to selected folder [ folder location ]
Permanently delete items in archival folder after [ n ] days
--------
A menu for Archiving could show "content about to expire" - list the items showing each with the # of days before it expires.
Sons of Anarchy S06E12 - to be archived in 12 days - auto deleted in 42 days
Mad Men S06E11 - to be archived in 13 days - auto deleted in 43 days
etc
This kind of feature helps keep fresh items in the main menus while giving a nice place to preserve the old stuff without cluttering things up. When things are "Archived", it would be nice if Plex could include the metadata in a file that would make it easy to restore later if needed as well.
I really think that Plex should try to accommodate most use cases without requiring users to routinely fuss around with file systems manually. Otherwise you will need an IT qualification to use it and this limits the user base to geeks like us.