"No matter how trustworthy, reliable, and secure they try to be, every one makes mistakes." Which can include you. I get that it'd be pretty hard for anyone else to access code that is just on your own laptop plus encrypted off-site backup storage, but once you get to the point where you need to collaborate with other people and need some sort of a service available on the web, I'd put more trust in the security chops of a trustworthy third party than I would in myself.