I don't think they make copies. I've heard they keep them in the HQ in Stanford but, that just what i've heard. What kind of tapes dose WWE use anyway? I know Vince owns AWA,NWA,Jim Crockett Promotions, SMW, WCW, ECW. I don't know if he owns anymore or not.
It seems like Hulu picks up the international version of Smackdown. They usually dump out "extreme" violence and (I think) most female-on-female fighting. They also wedge in a from the vault to pad out whatever gets cut out.