File Management allows you to set files to automatically delete sitewide and/or per workspace.
Delete Old Files Sitewide
If you wish for all files on your site to auto-delete after a set period of time (except for files governed by "Per Workspace" settings, see below), click the "Automatically delete all files older than" radio button and set the number of days when the files will be deleted. Once a file has been on the site for the given period of time, it will automatically delete at the top of the following hour (e.g. 2:00, 3:00, etc.). NOTE: "Delete Old Files Per Workspace" settings take precedent over Sitewide settings.
Delete Old Files Per Workspace
Alternatively, or in conjunction with Sitewide settings, you can set files within specific workspaces to auto-delete. Click the "Select a Workspace" drop-down menu and choose the workspace you wish to set. Then enter the number of days files should remain in the workspace. Entering a "0" (zero) will cause the files to never delete automatically (though they can still be deleted manually by anyone with permission). If you wish to add additional workspaces, just select another from the drop-down menu. NOTE: As mentioned above, this feature takes precedent over the Sitewide setting above.
Be sure to click Update Settings when finished.
Example: Say you set the Sitewide settings for 30 days, workspace "ABC" to 10 days, and workspace "XYZ" to 0 days. Now, most of the files on your site will delete after 30 days, but the files in "ABC" will delete in 10 days and the files within "XYZ" will never delete (unless deleted manually).