GPS Data Logger Software - BT747

When I have reach the 2 MB limit of my device, there are two options for me: erase the memory and begin fresh, or use "overwrite when full".

For BT747, I know the latter option would force full downloads instead of incremental (smart) ones. But how could I append the new data to my existing log file (.bin)? It seems by the warning message when downloading, that after erasing the memory the log file would be overwritten. What in the case of of overwriting?

Ideally, I could keep one big log. Else, I suppose I have to cycle every month except when a trip spans two months.