As a result of the previous indieGogo campaign, we not only got the funding but also a few stretch goals. One was adding SDCard support to the uRADMonitor D, and can tell you - this wasn't easy. First it involved redesigning the PCB and making enough space for the card slot. Then it was the software: spi communication, card physical layer then the file allocation table implementation.
Finally, after many tests, we have the basic card functionality up and running. The pictures shows one of the latest uRADMonitor D iterations, using a 16GB SDCard.
Now how much data will we be able to hold on those? Easy answer: all of it :)