3 days retain backup solutio n for remote server data

remote_backup_server_data.sh

#!/bin/bash
# 
#author: Aysad Kozanoglu
#
#

# Directory in which to store the backups
ROOT_DIR=/mnt/backup
REMOTE_USER=root
REMOTE_PATH=/mnt/drbd/var/mail/vmail/espresto.com
REMOTE_SERVER=bart
LOG_FILE=/var/log/rsync-backup.log
DATE=$(date '+%Y-%m-%d %H:%M:%S')

# step 1: delete oldest snapshot
if [ -d $ROOT_DIR/daily.3 ]; then
    echo "$DATE deleting oldest snaphost ">> $LOG_FILE
    rm -rf $ROOT_DIR/daily.3
fi

# step 2: shift middle backups back by one if they exist
if [ -d $ROOT_DIR/daily.2 ]; then
    mv $ROOT_DIR/daily.2 $ROOT_DIR/daily.3
fi
if [ -d $ROOT_DIR/daily.1 ]; then
    mv $ROOT_DIR/daily.1 $ROOT_DIR/daily.2
fi
# step 3: make a hardlink copy of the latest backup
if [ -d $ROOT_DIR/daily.0 ]; then
    cp -al $ROOT_DIR/daily.0 $ROOT_DIR/daily.1
fi

# step 4: rsync from the system into the latest snapshot (notice that
# rsync behaves like cp --remove-destination by default, so the destination
# is unlinked first.  If it were not so, this would copy over the other
# snapshot(s) too!

echo -e "$DATE Begin with rsync \n" >> $LOG_FILE
echo -e "=================================\n" >> $LOG_FILE
echo $DATE >> $LOG_FILE
rsync -avzh --out-format="%t %f %b" --delete $REMOTE_USER@$REMOTE_SERVER:$REMOTE_PATH $ROOT_DIR/daily.0 >> $LOG_FILE 2>&1


# step 5: update the mtime of daily.0 to reflect the snapshot time
mkdir $ROOT_DIR/daily.0