Supposed to be losseless or whatever no different than png so transfer won't lose quality unless the discs you've used are poor quality where you may get a read error,if you have the original source cd's it won't matter,if you downloaded the flac do you really want to do it again,in the end if you can't hear quality loss it won't matter,certainly won't when you get older

edit:ps i have original cd's i created flac from i also created mp3's with those same cd's i can't tell the diff between the mp3's or the flac