Backing up photos whilst travelling - aka which tablet/OS do you use?

I'd Have multiple cards, back up to a tablet, and upload JPEGS to Flickr, where there is 1TB of storage for free

I almost always shoot in RAW. How are peoples experiences of tablets for handling these?. I like the idea of an ipad if I can get one cheap enough, but will it handle DNG files?

Also, this device looks like it could be a bit of a winner:
http://www.amazon.co.uk/Kingston-Companion-Storage-Battery-Charger/dp/B00KU2E9IW...=sr_1_1?ie=UTF8&qid=1435764264&sr=8-1&keywords=kingston+wireless+g2

The K3 can copy from one SD card to the other by folder, so it's easy to copy it all at the end of the day (saves deleting non-keepers twice). A wi-fi enabled card (such as the Toshiba Flash Air) would also be able to send it to an Android device and upload to a choice of cloud services, assuming you have a wifi or other data connection.

I envy you the trip - it must be a great experience. Have fun!