New Airing Recordind VS Repeats And New Airings

ok can anyone clarify to me what a “new airing” is, is this an episode that is new to my server, or one that is listed as brand new on the guide?

Also if I choose to record all airings, will repeat episodes record to my folder, if I have already captured that episode at a previous time?

want to get all airings of a show to my folder, have it build the entire show database, but not have it record duplicates.

New is a show marked as new in guide, a first time airing of a show. New and repeat will record all episode of a show. Myself and others get episodes recorded even when already in my library.