Rsync between server a clients (push/pull)

sincro.sh

#!/bin/bash

OPTIONS=-azPv

if [ "$1" == "push" ];
then
  echo $SIN_LOCAL_FOLDER
  echo "to"
  echo $SIN_REMOTE_FOLDER
  rsync $OPTIONS --delete --backup  --backup-dir=$SIN_BACKUP_REMOTE $SIN_LOCAL_FOLDER $SIN_REMOTE_HOST:$SIN_REMOTE_FOLDER
fi

if [ "$1" == "pull" ];
then
  rsync $OPTIONS --delete --backup --backup-dir=$SIN_BACKUP_LOCAL $SIN_REMOTE_HOST:$SIN_REMOTE_FOLDER $SIN_LOCAL_FOLDER
fi

if [ "$1" == "config" ];
then
  echo "SIN_BACKUP_LOCAL=$SIN_BACKUP_LOCAL"
  echo "SIN_BACKUP_REMOTE=$SIN_BACKUP_REMOTE"
  echo "SIN_REMOTE_HOST=$SIN_REMOTE_HOST"
  echo "SIN_REMOTE_FOLDER=$SIN_REMOTE_FOLDER"
  echo "SIN_LOCAL_FOLDER=$SIN_LOCAL_FOLDER"
fi

if [ "$1" == "help" ];
then
  echo "SETUP FOLLOWING VARS:"
  echo "-------------------------"
  echo "export SIN_BACKUP_LOCAL="
  echo "export SIN_BACKUP_REMOTE="
  echo "export SIN_REMOTE_HOST="
  echo "export SIN_REMOTE_FOLDER="
  echo "export SIN_LOCAL_FOLDER="
fi