Ok I'm connected to the web console and lanch the 3 commands.
The two first are ok, but the last send me the return :
root@LACIE-CLOUD.local /$ tar -cf /tmp/rsync_3.0.9.tgz -C /usr/sbin
tar: Cowardly refusing to create an empty archive
Try 'tar --help' or 'tar --usage' for more information.
I reach a pb in creation of the tar file and the directory is empty...
Edit ----
With the xf parameter an other message :
root@LACIE-CLOUD.local /$ tar -xf /tmp/rsync_3.0.9.tgz -C /usr/sbin.
tar: /usr/sbin.: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now
Install failed.. server rsync can't restarted.