Unison est un logiciel de synchronisation, semblable à rsync.

Une question est posée lors de la création d'un Profile : [_] Syncronization involving a FAT partition

Ok avec une FAT32.

https://www.linuxquestions.org/questions/linux-software-2/unison-with-ntfs-4175657755/
NTFS is not compatible with symlinks and unison will not copy it over. Look at the documentation below, Permissions are covered too.
https://www.cis.upenn.edu/~bcpierce/....html#symlinks As far as I know rsync would have the same problems as Unison.
With samba it is possible to have a share as read only.

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