How to bulk retrieve/transfer data such as email open information

I have a question.
We are looking for a way to use AI to analyze email open information obtained by Eloqua.
When doing so, we need to transfer a large amount of data, but doing it manually is not practical, so we are looking for a way to do this.
Even if we use API, depending on the amount of data, it may not be possible to obtain it all at once, so do you have any other ideas for this method?
thank you.