BackupScript

#!/bin/sh
USERNAME=myUsername
DIR_TO_BACKUP=/home/$USERNAME
HOW_MANY=3
BACKUP_LOCATION=/media/2tdrive
DATE=`date +%Y-%m-%d`
FILENAME="$USERNAME_$DATE.tar.gz"

OLD_DATE=`date -d "-$HOW_MANY days" "+%Y-%m-%d"`
OLD_FILE="$USERNAME_$OLD_DATE.tar.gz"
BACKUP_FILE=$BACKUP_LOCATION/$FILENAME
OLD_BACKUP_FILE=$BACKUP_LOCATION/$OLD_FILE

echo "Creating backup file $BACKUP_FILE"
tar czf $BACKUP_FILE $DIR_TO_BACKUP 2>>error_$DATE.log

if [ -f $BACKUP_FILE ]
then
    echo "Backup Done"
else
    echo "Something went wrong"
    `cat error_$DATE.log`
fi

if [ -f $OLD_BACKUP_FILE ]
    then
    echo "Removing File that is $HOW_MANY days old"
    rm $OLD_BACKUP_FILE
    echo "Removed $OLD_FILE"
fi