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> OpenBSD's FFS can be told to be fully synchronous, making it about as robust as can be for not being journaled.

I am very interested, is there anything we can read to achieve that?

You can look at the mount command and the "sync" option: https://man.openbsd.org/mount

If you're really curious about it, Michael Lucas wrote a full book about the OpenBSD file system.

Man, thanks for this precious tip