Is there any Size issue that you are using copy and archive option. Why don't you use Custom Time & Versions together in your budgeting process. I would not get into Copy and archive option unless I run into space issues. It has a lot of maintenance attached to it.
And if you have space issues you wouldn't be able to unarchive the archived models without taking your production model down.
It doesn't matter if you are using Native Anaplan Time or Native Anaplan Version. As long as you are using Custom Time and Custom Version in your model you can easily scale up your model to multiple years. In nut shell instead of having one model each year you can introduce multiple years in one model and roll forward your model at the year end.
How? You already have a custom time hierarchy in place (make sure this list is for multiple years) and now you introduce subsets within the list. That subset can have current year & previous 2 years of items in it. This subset should be populated with the help of a process in yearly rollover maintenance so that your model aligns to your current year. (Note: Be careful about populating the subsets as this can be data destruction activity)
If you keep archiving your models, although it will work fine, you have to use copy & archive option and delete the data in current prod model manually every year which can be laborious and time consuming activity. Also if you have to export the Prior year data out of models you will have to unarchive the model and take the export and the list goes on.
I have attached how the custom time hiearchy currently looks like:
T1 - Year
T2 - Quarter
T3 - Periods
Currently there is only 1 item in the Year, which is "NY" because in the current year we make the budget for next year.
In terms of versions: I am using Anaplan native versions, because every budget cycle happens in 3 submissions and I also want to compare the figures from one submission to another submission. So my versions look as attached.
When making the model, I was not aware of the fact that we would need to capture also history. So the entire model is setup as if it only contains 1 year. Some modules, which do not need the detail of the periods, don't even have a custom time list as a dimension.
I think I would need to do a lot of rework to add the custom time dimension to all of the modules.