3.3.2 upgrade to 3.4 historical data

Hi all

I am upgrading from a 3.3.2 appliance to a 3.4 one and notice that not all information is being imported ie the historical information.

From chatting to people who have done previous upgrades and looking at the old appliance it looks like previous migrations did import historical data.

Is there a way to bring over the data?

Ideally I don't want to keep the old appliance hanging around for historical reporting purposes.

Cheers

A.