In the Audit log (Auditlog) under Settings > Security > Audit log (Instellingen > Beveiliging > Auditlog) you can see exactly who changed what in the system. This is useful if, for example, you want to check whether an employee who has left exported any data. The audit log is also needed for audits by external bodies. You can filter by category, action and period, and export the log as a CSV file.
The audit log, showing the time, action, user and area for each entry.