Hello,
I synchronize the folders, however the error does not come from a file replacement, but from an incorrectly named file name in UTF8.
I just found the solution to correctly rename my files with convmv:
"convmv -f iso-8859-15 -t utf-8"
I will therefore make a script to synchronize, and then rename the files, it's a shame because the synchronization will break the renaming every time: / and I cannot modify the source.