/etc/cron.daily/backup-wordpress.rb

backup-wordpress.rb

#!/usr/bin/env ruby

require 'pathname'
require 'fileutils'

def backup(src, dst)
  src_path = File.expand_path(src)
  dst_path = File.expand_path(dst)
  name = File.basename(src)
  name = File.join(dst_path, name) # full path
  p name
  return false unless Pathname.new(name).absolute?
  p name
  backup_filename = name + '.tar.gz.' + Time.new.strftime('%Y%m%d%H%M%S') 
  p backup_filename

  cmd = "tar cvfzp #{backup_filename} #{src_path}"
  `#{cmd}`
  purge_old_backups(name, 3)
end

def purge_old_backups(backup_name, number)
  files = []
  Dir::glob("#{backup_name}.tar.gz.*").each do |f|
    files << f
  end
  files.sort!
  (files.size - number).times.each do 
    puts "Removing #{files.first} ..."
    FileUtils.rm(files.shift)
  end
end

backup('/mnt/nfs/wordpress', '/mnt/nfs/backup/wordpress')