Zend certified PHP/Magento developer

Mail migration from Google Workspace to Synology failed halfway. What to do?

I recently bought a Synology DS723+ so that I could migrate away from Google Workspace. I configured the MailPlus Server and started to migrate.

The first issue is that it takes forever! One of the accounts took 2 days and the one I’m currently importing has been going on for 6 hours. The one that took 2 days was my personal Google Workspace account – and it failed halfway!

Is there a way I can pinpoint why it failed so that I can complete the import? If I start the import again, will I get duplicates in my inbox?

BTW: How do I disable indexing while importing, I think it slows things down.
I’ve pressed stop indexing in the GUI, but it does not seem to have any effect.

Cheers,
Martin