Making backups of your photos while you’re on location is essential, and there are plenty of ways to do it. I own a WD My Passport Wireless hard disk that works well (and it’s been supplanted by the new My Passport Wireless Pro).
But for some people, the solution is to build it themselves. Lenin at Moving Electrons put together a package built around a Raspberry Pi to store and access photos from his iPad Pro. It’s definitely a more geeky approach, involving lots of custom code, but looks like a great project. Check it out here: Backup Photos While Traveling With an iPad Pro and a Raspberry Pi
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The iPad for Photographers 