There’s a couple of SDXC cards available to be tagged ‘industrial’, I found a 16GB Kingston one for 12€.
SanDisk has a white paper on these quoting use in automotive solutions.
I think it’s a reasonable step up in terms of reliability and cheaper than a SSD.
It’s not a perfect solution, though. You will still need to complement it with a UPS and backup solution if you want to be on the safe side.
Check out this post.
