Yeah, I'll get right on that Mars mirror.
Seriously, I didn't say he was wrong in theory, but focusing so much attention on the highly unlikely to the detriment of the exceedingly common is a drastic distortion of the issue, and a cost/benefit analysis skewed in either direction can have costly repercussions.
Every spot in our solar system is susceptible to some unrecoverable disaster. If you don't want to lose your data, you have to have copies in more than one physical location.