I voted for system recovery when I am only allowed to choose one, because without it you don't have anything to recover when something fails (hardware, software or brain.exe).
I am confused by the brain.exe discussion, which is a bit over estimated IMO. I agree with the "brain.exe is imported", but I am disagreeing with "brain.exe is the only thing I need and relying on software is stupid".
In real life for instance you can lower the chance of someone stealing your car by not parking it in dodgy places, but that does not reduce the chance of car theft to zero.
Reversly locking your car, needing a key (code) to start it, adding a bearlock and a tracker also does not reduce the chance to zero, but is considered best practice for high value cars.
Using this real life comparison I realize that my data is not high value, meaning the extra (software) precautions I make are probably not necessary when I am using common sence.
With common defenses (e.g. Avast free) and common sense (brain.exe) the ordinary PC user is most likely well protected.
So I agree that brain.exe is important and security software can't compensate human stupidity.
This is the reason I explicitly added "brain.exe" to when something fails, because brain.exe can also fail IMO (unless the brain.exe believers are convinced their brain.exe can not fail).
