Hello,
I spent some time to locate the documentation for backup/restore in Firepower 9300 managed FTD modules.
I have found the one that talks about FTD modules in Firepower appliance 7000 & 8000: https://www.cisco.com/c/en/us/td/docs/security/firepower/621/configuration/guide/fpmc-config-guide-v621/backup_and_restore.html
I don't believe the procedure is the same for 9300 appliance. I've done some testing and it seems like the FTD configurations are not backed up using FMC only.
Has anyone tried this yet?
Let me know
Ji-Won