Hi! This might be a silly question. But here goes: 1) I hear emails from my gmail account don't get duplicated if they have several labels (they simply appear in the relevant folders) 2) I backed up my gmail account by using the "copy folder" add-on and copying the folders corresponding to my labels to a a place in "local folders." I couldn't copy in one go because the size was too big and the copy would crash, so it was done bit by bit. => Will the emails with several labels remain unique in this backup? Or does the fact that I separately copied several folders containing the same email make it possible that there are several separate copies of it in local folders? (For that matter: is there a better way of making a backup of my gmail account via thunderbird? This method I used was nasty and time consuming)