I use rsync to backup all the files from a specific folder in a USB drive connected to my Mac (Osx 10.9) to a folder of my home network NAS.
The problem is that rsync replace all files and it does not skip existing files. Where I'm wrong? I use rsync 3.0.9.
rsync -avzh --delete --progress --filter='-p .DS_Store' /Volumes/USBDrive/Foto/* /Volumes/Nas/Foto