I have a new macbook air and I'm trying to figure out just how I sync my apps on my iPhone and iPad. My older laptop had the Sync Apps on in iTunes. The new one has the default setting off and I'm a bit concerned about the "all existing apps and their data will be replaced with apps from this iTunes library". I've been basically updating and installing my apps right on the devices and I have everything set up the way I like it. Will syncing the apps mess all of that up?