Simple rsync-backup script

backup.sh

#!/bin/bash

BACKUP_DIR=/mnt/backup


TODAY="$(date +%YW%W_%u-%A)"
YESTERDAY="$(date -d Yesterday +%YW%W_%u-%A)"
DEST="${BACKUP_DIR}/${TODAY}"
LINK_DEST="${BACKUP_DIR}/${YESTERDAY}"

function rsync_func () {
    SOURCE="${1}"
    TARGET="${2}"
    EXCLDES=$(for i in $EXCLUDES;do echo -n " --exclude=${i}";done)

    if [ -e "${LINK_DEST}_${TARGET}" ]; then
        LINK_DST="--link-dest=${LINK_DEST}_${TARGET}"
    else
        LINK_DST=""
    fi

    [ -e "${DEST}_${TARGET}" ] || mkdir -p "${DEST}_${TARGET}" || return $?
    echo rsync -avz --delete $EXCLDES "$SOURCE" "${DEST}_${TARGET}" "${LINK_DST}"
    rsync -avz $EXCLDES "${SOURCE}" "${DEST}_${TARGET}/" "${LINK_DST}/"

    return $?


}

echo
echo "+--------------------------------------------------------------+"
echo "TODAY     : $TODAY"
echo "YESTERDAY : $YESTERDAY"
echo "DEST      : $DEST"
echo "LINK_DEST : $LINK_DEST"

echo Backup ansible
EXCLUDES='server-config .git .cache'
rsync_func /home/ansible ansible 

echo Backup openvpn
EXCLUDES='.git'
rsync_func /etc/openvpn openvpn

echo Backup bind9
EXCLUDES='.git'
rsync_func /etc/bind bind9

echo Backup root
EXCLUDES='server-config .git .cache'
rsync_func /root root

echo Backup /usr/local/bin
rsync_func /usr/local/bin usr-local-bin 

echo Backup packages
dpkg -l|awk '{print $2}' |gzip > "/mnt/backup/${TODAY}_packages.gz"