Problem with rsync in AppleScript
Run type rsync in Terminal and take note of the path (I assume /usr/local/bin/rsync but this may be different in your case)

Call this version of rsync in your AppleScript
do shell script &quot;/usr/local/bin/rsync -azvp '/Volumes/MAC SSD X5' '/Volumes/Backup/MAC SSD X5' - ...



PS: --rsync-path is used to &quot;specify the rsync to run on remote machine&quot; which isn't relevant if you rsync between locally-mounted volumes.