I know if I make a Time Machine backup, I have the option to restore from it when I do a fresh install of OS X. What confuses me is this -- What exactly does it restore? Let's say I'm having problems with my Mac. I can't locate the source of the problem, all I know is that it's some cumbersome file located somewhere in the depths of my Mac that's giving me a hard time. It's not worth my time to deal with it, so I decide to backup my applications, documents, photos, etc., and do a fresh install of OS X. If I chose to restore my [freshly installed] Mac from my previous Time Machine backup, I know it would restore my applications and whatnot, but would it end up restoring this cumbersome file from my previous Mac? Also, does it restore settings? > For anyone interested in why I'm asking. I play League of Legends, and something on my Mac is interfering with the ping. When I play on my Windows laptop on the same network, I can play flawlessly without ping problems, but my Mac consistently gets ping spikes. I think a certain file/application/setting on my Mac is interfering. I'm hoping a fresh install of OS X and a careful observation on applications will fix the issue.