For me, the value of a well kept set of notes is twofold. One: it can be helpful to locate a note on a particular topic and the context of that topic when I learnt first about it. Two: the very act of writing it down helps fixing the content in memory.
So: imagine yourself wanting to locate a note in both a set of notebooks and a set of files in a computer. That’s less elegant and more time consuming than locating a note in just one medium.
Then: how are you going to refer to your handwritten notes from the electronically kept ones? (and vice versa, should it occur to you to add to your old notes)?
Also, by the very act of copying and, perhaps, redacting your notes you will be able to remember much more of the topics.
In my opinion, it would be time well spent, if done intelligently.