For migrating everything, I just made a backup of the C-5 and restored it on the C-7. Bingo, the integrations were there and working on the C-7 for Lutron and Hue.
For the Z-Wave devices, I used Bruce’s migration procedure here:
I’ve only got about a dozen Z-Wave (all Plus except one), and half of those are just repeaters, so it was a quick migration.