@bich Again, not sure about it. I changed instance 2 years ago, making sure all data was exported. ( There is a list to chose from which data you want or don´t want to exportt)
And that went fine...
Made another back-up instance "just in case" too. That one is nice and empty

@bich Not really clear for me too. Not being an expert . But did you export all data from your old instance first ? Starting with a complete new instance , not connected in any way with the old, and importing the data should do it ?