can this work even if I am using the disc version?(not the digital version) meaning i just copy the 18.7 gb file i have now to external hard disk,reformat my comp,install origin,enter my username and password,then i shud see the game icon there rite?so i just need to initiate the download a litttle bit,stop it,and close origin rewrite the new installation folder with my backup and resart origin again and continue?

btw,does this mean that they wont ask for the key anymore once i have registered the key to my account?(by saying this meanig i dont need the disc or my key anymore as long as my username and password is with me))

plz help, gonna reformat soon and i misplaced the whole god damn thing!!!