I argue leaking SSH key is not the worst nightmare but definitely one of the top five on anyone's list. I am more worried about source code and database leaks t

I argue leaking SSH key is not the worst nightmare but definitely one of the top five on anyone's list. I am more worried about source code and database leaks through development cycle. Copied production data to dev environment and clone source code to your laptop. How does Google/Facebook handle this? I can't imagine anyone cloning their 30G or whatever size single-branch repository down to laptop (they may do shallow clone but doesn't matter).