it's a character encoding, not a file type. Doesn't really makes sense. Option exists for both bibliographic records and authority records.
There are three MARC options: MARC (non-Unicode/MARC-8) MARC (Unicode/UTF-8) MARC (Unicode/UTF-8, Standard) I'm not sure what the difference between Unicode and Unicode Standard are, but it seems sensible to keep at least one of these. In order for compatibility with other systems, it seems most practical to keep a non-unicode and a unicode export, but I'm happy to take advice on this.
Hm, I am not sure if Aleisha meant the download/export options for records or not. Aleisha, can you clarify? > MARC (non-Unicode/MARC-8) > MARC (Unicode/UTF-8) > MARC (Unicode/UTF-8, Standard) > > I'm not sure what the difference between Unicode and Unicode Standard are, > but it seems sensible to keep at least one of these. Standard doesn't include the non-standard 9xx $9 x9x, xx9 custom fields :)
I believe all available options produce different formats/output, so this might be invalid. The internal naming could probably be improved.