Upgrade from v159 to current version

The sytem is Odroid XU4 very stable on v159 but I was thinking of upgrading as support for Jessie seems to be falling off. The sensible way of course is to get a new SD card and keep the old system safe, which is what I will do.

The system runs a few Wordpress sites - what’s the best way to move these sites to the new system?

John