The first people making a fosselfie would make a dent for sure. In the rock.

There's some interesting developments in that area, on the one side about leaving warnings at nuclear waste sites (which probably won't work, archeologists were warned about death and curses and such and still went into Tutanchamun's tomb. IIRC some died from a mold spore active in there), on the other about preserving knowledge for the ages (e.g. sapphire disks, 3d / holographic storage). I don't feel like there's a working solution yet, or at least not a high-tech one - chipping out a granite block and keeping it relatively shielded from the weather still seems like the safest bet.