Hi @Eaven HUANG ,
Thank you for posting in Microsoft Q&A forum.
1,==Another concern is, is there any backup plan available just in case any steps go wrong and we are able to roll back to the working 2207?
Yes, we strongly recommend that you initiate a site backup before the upgrade. For more details, please refer to:
Back up a Configuration Manager site
2,==>So what are the correct steps to update to 2309? do we need to do it one version by another, or we can just update to 2309 directly?
We do not need to do it one version by another. Per my experience, SCCM version 2309 is available as an in-console update on sites that run version 2207 or later, so that you can just update SCCM from Version 2207 to the latest version 2309 directly. For more detailed steps, please refer to:
Complete SCCM 2309 Upgrade Guide
Step-by-Step SCCM 2309 Upgrade Guide
Thanks for your time. Have a nice day!
Best regards,
Simon
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