The History (Backup / Restore / Migrate / Download) under System Status is available as long as the organization is active. It is purged only when the organization is deleted.
If an organization is deactivated and the grace period (45 Days) is over, the organization enters a “Purge” state. At that time, the system status information is also purged. If the organization is reactivated during the grace period, then the organization then enters an “Active” state. Therefore, the old system status information is available.