Indeed. Real security is not achievable on a professional grade system much less an end user system. And I totally get where you are coming from with Google. Do some searches for call centers in India holding data for ransom from their clients, its shocking. You just have to do the best you can and limit your losses as much as possible. My goal is not to be completely secure but rather I just try to be more secure than the majority. By not being "low hanging fruit" I can fell pretty good that I will be ok when something happens. I know I am speaking to choir here and, admittedly, BTC is very different in that regard. So I just do what I do with my other bank accounts, have many and keep small amounts in each. My savings is in a credit union account with no electronic access. When I need money from it I have to go in person or get them to mail me a check. Its a pain but I never have to worry about more than a few hundred being stolen when my card is compromised. All things being equal, I trust Google more than anyone else.