I’ve seen people use enclosures or whatever to clone drives, but I’d just like to transfer my existing deck drive contents over to the new deck when it comes without having to mess with taking things apart. Is there any software way to do this?
Or can I just use an existing USB external drive I have, format it, clone the old deck to that, then clone from that to the new deck?
Yes. You can either clone or image the drive - then clone or restore the image to the new Deck.
Make darn sure your OG Deck is on STABLE with 3.5.5 so there are no hiccups.