We recently migrated successfully our application from Mendix Cloud v3 to Mendix Cloud v4. In this process we created a recent back-up to restore on Cloud v4, but copying the complete archive with the “old” (monthly) back-ups is hopeless work.
It would be a good start if all old back-ups would be available in the Mendix Cloud v4, such that valuable data which could be deleted accidentally can be restored.