Backup SD cards to usb sticks or external HDD without computer
How do you guys back up your sd cards during your trips?
I have a usb SD card reader and I can bring with me some usb sticks and/or a usb external HDD, but I won't bring a laptop. Last time I relied on fellow divers who had a laptop and they were kind enough to let me use it for the transfer, but are there any alternatives?
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