Current Mac server is running Connect 9.2.7 on Mac OS 10.11.6.
New Mac server will run Connect 9.2.12 (patch1) on Mac OS 10.15.4.
The mailstore is on an external Promise RAID.
Bearing in mind I will be switching from 32 bit to 64 bit, it looks like I can just switch the RAID to the new Mac, then follow the 'Method 2' directions here: