Rotating backup with rsync

gistfile1.sh

#!/bin/bash

BACKUPPATHS=( "BACKUPUPDIR1" "BACKUPDIR2" "BACKUPDIR3" )
TARGETPATHS=( "TARGETOFBACKUPDIR1" "TARGETOFBACKUPDIR2" "TARGETOFBACKUPDIR3" )

for (( k=0 ; k < ${#BACKUPPATHS[@]} ; k++ )) 
do 
  echo -e "Making backup of ${BACKUPPATHS[$k]}" 
  rsync -avz --delete --link-dest=${TARGETPATHS[$k]}/`date +%a -d "-1 day"` ${BACKUPPATHS[$k]} ${TARGETPATHS[$k]}/`date +%a`
done