Unfortunately, only very few SCO Unix 3.2 machines had the optional, pay extra for, tcp/ip support.
By any chance is there a usable serial port on the machine? If so, you could use a null modem cable, and any binary transfer protocol that the SCO machine has on it. Then connect the other end to a laptop or desktop booted off of any one of the Linux LiveCD distributions and use local storage or a USB drive to store the data.
Barry