I tend to use a combination of native Anaplan versions and fake versions (FV)
Real versions are one of the most powerful Anaplan features for me due to switchover (space saving, and just the general awesomeness of being able to actualise data with the change of a dropdown date), as well as the bulk copy.
I tend to only keep a limited amount of real versions (ACT, Live FC, Budget and possibly on previous FC). This is to limit the impact on size (as you know, there is no subset functionality for versions)
I then use FV in my reporting modules where I then add multiple "previous versions" without impacting the size of other modules where versions were used as well as have the ability to use the LOOKUP function for versions (assists in version comparison)
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