This is for any CMS, but I needed to add an automatic backup when I migrated a site to WordPress. Most folks use a plugin, but I’m old-school and like to use cron. You need to know some Unix to implement this.
The backup system has (at least) two parts: the cron job on the server to dump the database, and a cron job on my desktop PC to download the files.
On the server side, I have a cron job that runs every midnight to dump the database.
0 0 * * * /usr/local/bin/backup_databases
Just to make things easy, I backup to a directory alongside the websites.
#! /bin/bash # this file is /usr/local/bin/backup_databases PW=***password*** mkdir -p /www/backups # list all the databases in ths for loop for i in example_com example_org ; do mysqldump -u root -p$PW $i > /www/backups/$i.mysql if [[ -e /www/backups/$i.mysql.gz ]] ; then rm /www/backups/$i.mysql.gz fi gzip /www/backups/$i.mysql done
Every night, a new database dump is created, and gzipped up.
On the Backup System
I just backup to my desktop at the moment. Eventually, I’ll have a second backup on a Raspberry Pi based NAS.
My backup disk is at /mnt/backups. In there I have a directory, bin/, where my backup scripts are kept.
I have SSH keys set to allow me to connect to the server with a private key. This way, I won’t be prompted for a password.
Then, I construct an rsync command that will download both the backups and the website files. (You need to backup the uploads as well.) This gets saved into a backup script. It’s a short, five line script.
#! /bin/sh alias RSYNC="rsync -t -rv --delete --exclude '.private' --bwlimit=3m " mkdir -p /mnt/backups/example cd /mnt/backups/example RSYNC 126.96.36.199:/www/ /mnt/backups/example
Once that’s running, I copy it over to the NAS to run via cron on there.
I use the –bwlimit settings to prevent the backups from consuming too much of the internet link. The first backup will take a long time, but subsequent downloads will complete in much less time.
These backups are incomplete because they don’t create an archive. So, if I run the backup on a cron job, and my site gets hacked, I won’t have an old copy of the site to restore. Creating backup sets and archives is a bit more complex, but, for now, I’m making them by hand.