Always keep a backup of the complete S7Proj folder and the central SQLSERVER instance. Corruption is rare but catastrophic.
v7.1 SP1 firmly supports H-CPU Redundancy (CPU 414-4H, 417-4H). However, synchronization fiber optics (up to 10km) were managed via older Sync modules (6ES7 960-1AA04-0XA0), which went obsolete years ago. Simatic PCS7 v7.1 SP1
Report generated based on Siemens historical release documentation and industry knowledge. Always keep a backup of the complete S7Proj