PBCS - Maintaining Employee Data for previous Budgets

We are a federally regulated organization and will need to maintain historical budget data for at least 10 years. I was wondering how other organizations are managing historical employee data in PBCS cloud.

For example, my organization has an employee hierarchy that they use for planning purposes annually. Each year this employee hierarchy changes due to terminations or moves between departments. Moving these employees will impact historical Budget data within the application.

At prior organizations we would do a snapshot of the cube at year end and save it with the plan year as a reference. We would then provision specific planners to have access to that cube.