You're right ... also how many robots would last 70 years given the current accelerating rate of technology advancement, 70 years would be several generations and the older ones would just be scrapped as spare parts were no longer available (oh, I'm sure that's a gross simplification and they'd just move "personality" from one shell robot to the next and do brain upgrades, but the "point" here is that if the robotic brain can be copied/backed up, then where does "personality" come in as you can have multiple copies of exactly the same brain state, so 100% clones if you will)

Oh, and three cheers for Gaston!