An older wordpress multisite install moved to a new multisite or upgrade?

I have an older WordPress Multisite, that included some paid plugins, like WPMUDEV Wiki.

That installation was on a Mac OS X X-Server that had MySql built in.

I want to move that WordPress multisite to a new Mac OS X MacMini, with or without, apple server software. … The new Mac OS X server software does not include MySQL.

Both machines are now local on my desk. Where do I start?