Wingpilot wrote:
You can use the iPad to transfer photo files to. Apple has an SD card adapter that plugs into the iPad at one end, and and adapter that the SD cards slides into. Transfer begins automatically and the images are stored in the photos file. Get the iPad Mini with the largest amount of storage available--128GB, I believe. Should be enough for your trip. I don't know if you can transfer photos from the iPad to an external storage device, though.
I have backed up to my iPhone but it doesn’t seem to accept RAW files, only JPEGs.
While travelling I use a Windows tablet (Surface) to save to, then drag and drop to 2 hard drives.
This gives 2 backups that can be stored in different suitcases.