Migration strategy: what to bring

Clients say "bring everything", and in HCM that is worse than in finance because everything includes decades of employment history for people who left years ago. The three categories of must, should consider and usually leave behind. How much assignment history a current worker actually needs — ask what calculation consumes it before agreeing to load it. And the argument almost nobody makes: migrating personal data you have no lawful basis to keep is a data protection problem, not just a cost.