Backup on same drive example

05 00 * * * /root/backup.daily.sh > /root/wikibackup/daily.log 2>&1
20 00 * * 0 /root/backup.weekly.sh > /root/wikibackup/weekly.log 2>&1
40 00 1 * * /root/backup.monthly.sh > /root/wikibackup/monthly.log 2>&1

Result: After one year you will have

12 Monthly backups

5 or 4 weekly backups

7 Daily backups

The script checks if there are older backups then these parameters and if there are then it deletes them.

#!/bin/bash

# What folder to put the temporary backup files in
backup_dir="/tmp/wikibackup"

# What folder to store the complete backup.tar.gz in
storage="/root/wikibackup/daily"

# Create backup dir if it doesn't exist
if [ ! -e $backup_dir ]
then
echo "### Creating $backup_dir folder ###"
/bin/mkdir -v $backup_dir
else
echo "### Found $backup_dir, proceeding... ###"
fi

# Today's date
today=`/bin/date +%Y-%m-%d`

echo "### Dumping MySQL tables ###"
/usr/bin/mysqldump -v -u root -ppassword wikidb > $backup_dir/wikidb.$today.sql

echo "### Copying configuration files ###"
/bin/cp -v /var/www/deki-hayes/LocalSettings.php $backup_dir

if [ -f "/var/www/deki-hayes/AdminSettings.php" ]
then
echo "### Copying AdminSettings.php ###"
/bin/cp -v /var/www/deki-hayes/AdminSettings.php $backup_dir
fi

/bin/cp -v /etc/dekiwiki/mindtouch.deki.startup.xml $backup_dir

echo "### Collecting attachments ###"
/bin/tar -cvpf $backup_dir/attachments.tar /var/www/deki-hayes/attachments/ > $backup_dir/attachments.log

# Create backup dir if it doesn't exist
if [ ! -e $storage ]
then
echo "### Creating $storage folder ###"
/bin/mkdir -v $storage
else
echo "### Found $storage, proceeding... ###"
fi

echo "### Compressing backup files  ###"
/bin/tar -czvpf $storage/backup.$today.tar.gz $backup_dir

echo "### Removing temporary backup files and folders  ###"
/bin/rm -v $backup_dir/*
/bin/rmdir -v $backup_dir

echo "### Removing old backup files ###"
find $storage/ -type f -name "backup.*.tar.gz" -mtime +7 -exec rm -v {} \;

echo "### Done ###"