#!/bin/bash

## Edit part---------------------
SOURCE_PATH="/home/abc"
DESTINATION="/mnt/usb"
CYCLEDAY="30"
LOG="/var/log/backup.log"


## ------------------------------



## DONT modify below code ##

## variable assign
NEW_BACKUP_DIR=`date +%F`
LAST_BACKUP_DIR=`ls -1 $DESTINATION | tail -n 1`
OLD_BACKUP_DIR=`ls -1 $DESTINATION | head -n 1`
NUM_BACKUP=`ls -1 $DESTINATION | wc -l`

## delete old log
rm -f $LOG

## make new backup directory
mkdir -p $DESTINATION/$NEW_BACKUP_DIR


## check if over 90 backup directory to delete the oldest one
if [ "$NUM_BACKUP" -ge "$CYCLEDAY" ]; then
    echo "Deleting the oldest backup from storage, timestamp of backup - $OLD_BACKUP_DIR" >> $LOG
    rm -rf $DESTINATION/$OLD_BACKUP_DIR
fi

## rsync differential backup compare with last(yesterday) backup directory (copy symbolic link only)
/usr/bin/rsync -rltcv --delete --copy-unsafe-links --link-dest=$DESTINATION/$LAST_BACKUP_DIR $SOURCE_PATH $DESTINATION/$NEW_BACKUP_DIR >> $LOG


## To avoid compare the empty backup directory
## in rsync differential, remove empty new backup directory
if [ `find $DESTINATION/$NEW_BACKUP_DIR | wc -l` -eq 1 ]; then
    rm -rf $DESTINATION/$NEW_BACKUP_DIR
fi






	
	


        

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