Video recordings can be set to be deleted within a specific period of time using the Delete video recording(s) older than specified hereby option. 
The system permanently deletes any video files that are older than the specified age in days.
The two options are:
- Never delete
- Delete after __ day(s)
IMPORTANT: Videos that are intended to be retained should be locked, otherwise once deleted (manually or via automatic deletion), videos cannot be recovered.
See also How can I delete a recording?
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