Maybe we have been misunderstanding what those IDIC pendants actually were all these years.And he would almost certainly have had at least portions of that data (including futureScotty's transwarp formula) backed up on something compact and easily portable - a 64-Gigaquad thumb drive*, or its 24th-century equivalent.
(* Imprinted: "Property of Vulcan Science Academy - Not to Be Removed from the Premises without Prior Authorization"?)