CentOS 8 backup and CentOS 7 restore has been tested and is recommended.
If you installed the Gateway on CentOS 8, you should replace it with CentOS 7.
Red Hat Enterprise Linux (RHEL) recently announced that no further operating system updates will be available for CentOS 8 after December 31, 2021. As of now, updates and security patches for CentOS 7 will be available through June of 2024.
Future operating system support for EcoStruxure IT Gateway is currently under investigation.