As far was i know this is not possible. And from my point of view it makes no sense too... Frequently download your dives with one of the famous logbook software. Otherwise your dives will be overwritten after some time by newer dives anyway...
I already use Mac Dive to save dives and it is OK, but how can I restore parameters, recent Logbook and statistic (number of dives, longest dive, deeper dive) to the other OSTC 2C?
I understand the point of view of Scubatinoo, but I think that a device like OSTC should have the function to backup and restore data, so you can go on with other new OSTC computer.