Hard drives, being magnetic media and spinning ones at that, are a bad idea if you are mostly hitting offroad and the disk comes with you. Plus you will need electric for it to run.
Depending on how you are setup on the road, you could draw from the battery and power a raspberry pi, which can read the sdcard and interface with the hard disk as well.
If you do go down the route of a disk, i would highly recommend a laptop size disk 2.5" ones, and work through your redundancy options. Anything larger than a 1 TB 2.5" disk has terrible reliability. So your nett rate is going to be 1 disk per 16 to 18 of the 64gb sd cards.
256gb sd cards exist. And give you a better ratio to 1TB hard disks. Your storage concerns with those is going to be about the same as the hard disk except dont need to worry as much about shock.
The ruggedised laptops weigh a ton and are inconvenient to move with unless you are in a truck or have a tail vehicle anyway.
Finally you can get BAS boxes that are barely larger than a 3.5" disk that have a media copy function to copy sdcards to hosted disk. Also at 3.5" you can goto 4 TB disk with no loss on reliability. They need more power to run ( still ok to run off 12v ) and these disks are rated for desktop like storage and usage.
Hope this gives you a few lines of thought to chase.
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