rsync backup script (macOs)

backup.rb

#!/usr/bin/env ruby

#
# rsync backup script to sync files to external USB backup disks.
#
# - checks for mounted volume and name
# - saves log to backup volume
#
# Volumes have to be named BACKUP_001, then call with "./backup.rb 001"
#
# Warning: This script syncs and deletes! NO INCREMENTAL BACKUP!


#
# global default excludes
#
DEFAULT_EXCLUDES = [
  ".Spotlight-V100",
  ".Trashes",
  ".fseventsd",
  "_TEMP__",
  "FC_render",
  "*.lrdata"
]

#
# rsync wrapper, logs to stdout and logfile
#
def bak(directories, target, excludes = [])
  exclude_option = '--exclude ' + (DEFAULT_EXCLUDES + excludes).join(' --exclude ')

  logfile="/Volumes/#{target}/backup_#{target}_#{Time.now.strftime("%Y-%m-%d_%H%M")}.log"

  rsync = "rsync -ahuEP --delete --log-file=#{logfile} --modify-window=1 #{ARGV[1] == 'noop' ? '-n' : ''} --delete-excluded --ignore-errors #{exclude_option}"

  directories.each do |dir|
   cmd = "#{rsync} \"#{dir}\" /Volumes/#{target}/#{dir.gsub('/','_').gsub(' ','_').gsub("\\",'_').gsub("(",'_').gsub(")",'_')}/"
   puts "------------- #{Time.now} -- #{cmd}"
   p = IO.popen(cmd)
   while (line = p.gets)
     puts line
   end
  end
end

# check for vol number argument
number = ARGV[0]
puts number
exit unless number


# examples below .....



# !----------------------- BACKUP VOLUMES -----------------------


# --- BACKUP_001 ---
# 2TB 3,5
#
if File.exists?("/Volumes/BACKUP_001") && number == '001'
  unless File.exists?('/Volumes/music')
    puts "do mount the music!"
    exit
  end
  directories = [
    '/Users/knut',
    '/Volumes/music'
  ]
  excludes = [
    "'iPod Photo Cache'",
    "knut/Library",
    "knut/src"
  ]
  bak(directories, 'BACKUP_001', excludes)
end


# --- BACKUP_002 ---
# 2TB 3,5
#
if File.exists?("/Volumes/BACKUP_002") && number == '002'
  directories = [
    '/Volumes/daten/ARCHIV',
  ]
  excludes = [
  ]
  bak(directories, 'BACKUP_002', excludes)
end

# ...... more ......