I write here so I wouldn’t forget it. These are rsync options to sync between 2 directories. It will skip existing file and directory, keep the time preserve and sync recursively.
rsync -r -n -t -v --progress --ignore-existing -s [SOURCE DIR] [DESTINATION DIR]
This is a DRY RUN, which will not execute the sync.
Do this to make sure that your source directory and destination directory are valid to be synced.
If you’re sure to execute it, just remove the -n option.