How to track the department tree history

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Hello experts,

I need if possible some suggestions on how to keep the department tree history.

For example our customer sometimes makes some updates on department names and change the department tree hierarchy as well.

However, they would like to keep evidence of prior hierarchies. If I use the same department tree, the hierarchy history is being cancelled.

Do you have any suggestions on how to maintain the old department hierarchies?

Thanks in advance for your time!

Kind Regards,

Valerio