The most obvious thing to do is to connect the SD card to PC using a card reader or if you have a laptop, use an adapter depending on the available slots, then use the standard browsing in Windows to navigate to where your files are on the SD card and copy them to the PC. Reinsert the SD card, but be careful not to delete other files on it and then you can continue working with the device and the SD card. Additionally, use the SleepMapper Data Card Uploader to automatically pull the data from the device and upload it to the supported service. There is also a manual that you can read.