Migration Zoho One from US to EU

Migration Zoho One from US to EU

Hi everyone,
we are facing a big challenge that we have to migrate our Zoho One account from the US server to the EU server We are currently using many tools such as CRM, Books (FInance), Analytics, People, Survey etc. 
Is there any experience of this kind here in the forum that could tell us how the migration went. Our Zoho Support Germany could already answer some questions, but we do not have a guide or similar.
And with which tool do you start the migration?
Thank you very much for your feedback
LH