I am in the process of preparing for a fresh install of OSX Lion (there's a reason for this). I want to be able to restore my entire iTunes Library from an external HDD when all is said and done, but I don't want iTunes Match to rematch every single track again (I had a friend who copied just the Music folder of iTunes and re-imported the tracks and Match duplicated a good 500 songs). If I save the entire Library and then copy it back will all the iTunes Match history and all that be retained, or will I suffer the same fate?