Sony have the XDCAM HD Professional Optical Disc that you could dump your material to and if in the field make two copies and post one home.
It all costs money though and more $$$ than tapes.
I would never trust a hard drive to dump stuff too in the field, as it's a mechanical/magnetic/electronic device.
Hard knock/bump, moisture, power spike, magnetic filed, mechanical failure, failed circuit component all could knock it out. ![]()