Hi, I'm trying to find the most efficient way of boosting the Mac performance that starts to lag after several years of use. Backing up and blowing it out seems pretty easy method but will the performance boost be not as significant if I do a local hard drive time machine backup, wipe, then re install the OS vs copying individual folders that contain data? Basically, I don't understand what time machine decides to backup and what it opts out of it for the sake of efficiency. I feel it may transfer over some of the crummy performance issues during the recovery process through time machine and I'm better off performing individual folder copying. Anyway, any best practice from someone that does this a lot would be appreciated.