Large Volume Migration Question

I would like to migrate 50+GB of emails to seed the new zimbra server.
I expect that this will take several hours to export and import plus I have to send the data to a new data center facility.
Then I would like to re-run the export and import process again a day later hoping that only the 'changed' emails get updated; eg deleted and new.
I would expect the same large export, I expect the transfer time to be the same, but I hope that the 'changed' emails will import way faster because the emails have already been seeded.

Does the zetras migrate software work in this way?

Thanks