A simple rotational backup script that will rotate daily, weekly, monthly, and yearly backups.

BackupRotated

#!/bin/bash

SRC_DIR="/var/www/html"
BACKUP_DIR="/mnt/backups"
PROJECT_NAME="project"

BACKUP_RETENTION_DAILY=6
BACKUP_RETENTION_WEEKLY=3
BACKUP_RETENTION_MONTHLY=3
BACKUP_RETENTION_YEARLY=0

DAYYEAR=`date +%j`
DAYMONTH=`date +%d`
DAYWEEK=`date +%u`

if [[ ( $DAYYEAR -eq 1 ) ]];
        then
        FN='yearly'
elif [[ ( $DAYMONTH -eq 1 ) ]];
        then
        FN='monthly'
elif [[ ( $DAYWEEK -eq 7 ) ]];
        then
        FN='weekly'
elif [[ ( $DAYWEEK -lt 7 ) ]];
        then
        FN='daily'
fi

DATE=$FN-`date +"%Y%m%d"`
echo $DATE

function show_help {
    echo "BackupRotation available options are"
    echo
    echo "-s Sorce directroy to be backed up"
    echo "-b Destination forlder for the backups"
    echo "-n Name of the project being backuped"
    echo "-d Number of Daily backups to keep, negitve numbers will disable"
    echo "-w Number of Weekly backups to keep, negitve numbers will disable"
    echo "-m Number of Monthly backups to keep, negitve numbers will disable"
    echo "-y Number of Yearly backups to keep, negitve numbers will disable"
    echo "-h show this help text"
}

function backup
{
    tar czf $BACKUP_DIR/$PROJECT_NAME-$DATE.tar.gz $SRC_DIR
    cd $BACKUP_DIR/
    echo "Rotating old backups"
    ls -t | grep $PROJECT_NAME | grep daily | sed -e 1,"$BACKUP_RETENTION_DAILY"d | xargs -d '\n' rm -R > /dev/null 2>&1
    ls -t | grep $PROJECT_NAME | grep weekly | sed -e 1,"$BACKUP_RETENTION_WEEKLY"d | xargs -d '\n' rm -R > /dev/null 2>&1
    ls -t | grep $PROJECT_NAME | grep monthly | sed -e 1,"$BACKUP_RETENTION_MONTHLY"d | xargs -d '\n' rm -R > /dev/null 2>&1
    if [[ ( $BACKUP_RETENTION_YEARLY -gt 0 ) ]]; then
        ls -t | grep $PROJECT_NAME | grep htdocs | grep yearly | sed -e 1,"$BACKUP_RETENTION_YEARLY"d | xargs -d '\n' rm -R > /dev/null 2>&1
    fi
}

while getopts s:b:n:d:w:m:y:h option
do
        case "${option}"
	in
                s) SRC_DIR=${OPTARG};;
                b) BACKUP_DIR=${OPTARG};;
                n) PROJECT_NAME=${OPTARG};;
                d) BACKUP_RETENTION_DAILY=${OPTARG};;
                w) BACKUP_RETENTION_WEEKLY=${OPTARG};;
                m) BACKUP_RETENTION_MONTHLY=${OPTARG};;
                y) BACKUP_RETENTION_YEARLY=${OPTARG};;
                h) show_help
                   exit 0
                   ;;
        esac
done

echo $BACKUP_RETENTION_DAILY
if [[ ( $BACKUP_RETENTION_DAILY -gt 0 ) && ( ! -z "$BACKUP_RETENTION_DAILY" ) && ( $BACKUP_RETENTION_DAILY -ne 0 ) && ( $FN == daily ) ]]; then
    echo "Daily Backup Run"
    backup
fi
echo $BACKUP_RETENTION_WEEKLY
if [[ ( $BACKUP_RETENTION_WEEKLY -gt 0 ) && ( ! -z "$BACKUP_RETENTION_WEEKLY" ) && ( $BACKUP_RETENTION_WEEKLY -ne 0 ) && ( $FN == weekly ) ]]; then
    echo "Weekly Backup Run"
    backup
fi
echo $BACKUP_RETENTION_MONTHLY
if [[ ( $BACKUP_RETENTION_MONTHLY -gt 0 ) && ( ! -z "$BACKUP_RETENTION_MONTHLY" ) && ( $BACKUP_RETENTION_MONTHLY -ne 0 ) && ( $FN == monthly ) ]]; then
    echo "Monthly Backup Run"
    backup
fi
echo $BACKUP_RETENTION_YEARLY
if [[ ( $BACKUP_RETENTION_YEARLY -ge 0 ) && ( ! -z "$BACKUP_RETENTION_YEARLY" ) && ( $FN == yearly ) ]]; then
    echo "Yearly Backup Run"
    backup
fi