I only use Outlook 365 on my main PC, so all my mail and contacts, etc, are on that.
I need to undertake a clean re-install on the main PC so as a temporary or perhaps permanent backup measure I want to move all the data to the laptop (which has an un-setup Outlook 365 installation on it - it too has recently had a clean re-install so Office apps are installed but not yet setup on it).
Looking for how to do this I find mixed advice. Some sites imply this is a very complicated process; others say export to a PST and simply move that and open it.
There must be a proper way or better way to setup Outlook 365 for doing this.
Advice on this would be very welcome.

Laptop has latest version of Windows 10 and Office on it, as does current installation on my main PC.