There is a floppy connector.
It is some kind of one-to-one floppy disk copier.
Here I have a Replica-Box ST from 1987 TECHHart Handelsagentur ROM-Module +
Software that has 2 connectors.
It copies every disk on a one-by-one basis by synchronising both drives.
I think this does the same with one external drive and the internal drive.
Ronald van der Kamp /,`.-'`' -. ;-;;,
Stichting ST |,4- ) )-,_. ,\ ( `'::.
~atarist ----''(_/--' `-'\_)Proelie