What are the best techniques for modelling baseline and target architectures?
We're modelling a legacy migration in archimate and want to show how the app landscape will change over time.
Most the elements will remain the same but the connectors will change as new components replace the legacy box. E.g., in this simple example new components E and F will replace parts of D and the relevant clients (B, C) will change connectors accordingly:

If we have everything in the same model then we need many connectors to represent different time periods. If we have the baseline and target in different models then we need to copy all the elements from baseline to target and then manually update the baseline as the target gets implemented.
Are there any other alternatives?
thanks
Jason