If you want to synchronize two folders use next snippets.
1. Sync folder “source” content to “target” folder:
rsync -arpv --delete /mnt/source/ /mnt/target
Notice trailing slash for “source” folder!
2. Sync whole folder “source” to “parent” folder:
rsync -arpv --delete /mnt/source /mnt/parent
More info https://linux.die.net/man/1/rsync