My Mac is booting to the 'question mark' folder. I option-booted to 'Internet Recovery'. Before I proceed, I would like to know: Will 'Internet Recovery' necessarily erase my hard drive? Can anyone confirm this (maybe even provide a source link)?
No, doing an Internet Recovery will not erase your hard drive (unless you explicitly choose do to that using
Also, this question has been answered on superuser - see "Does Internet Recovery erase everything on my Mac?"