Perhaps I don't really know enough about computers and I'm sure that's the case, but.
Every so often, I will do a full factory restore on my G73. Seems like the easiest way to clean out all the crap in my machine.
I mentioned it offhand to one of the IT guys at work and he said that doing so could be damaging to my computer, no elaboration.
Just as an aside, when I asked him his opinion after I bought my Asus, he had one word for me "Sucks."
Is doing a factory restore every so often hurting my computer?