after-backup.rb

#!/usr/bin/env ruby
require 'droplet_kit'
token = 'put-your-token-id'
client = DropletKit::Client.new(access_token: token)
if File.exist?('/root/droplet_id') 
  begin
    droplet_id = File.read('/root/droplet_id')
    res = client.droplets.delete(id: droplet_id)
    until res.status == "completed"
      res = client.actions.find(id: res.id)
      sleep(2)
    end
  rescue
    #pass
  ensure
    File.delete('/root/droplet_id')
  end
end

backup.conf

# backup - backup service job file

description "backup daemon"

# When to start the service
start on runlevel [2345]

# When to stop the service
stop on runlevel [016]

# Automatically restart process if crashed
respawn

# Specify working directory
chdir /root

exec ruby backup.rb

backup.rb

#!/usr/bin/env ruby
require 'droplet_kit'
droplet_id = 9771628

token = 'put-your-token-id'
client = DropletKit::Client.new(access_token: token)
droplet = client.droplets.find(id: droplet_id)

sleep(10)

begin
  res = client.droplet_actions.shutdown(droplet_id: droplet.id)
  until res.status == "completed"
      res = client.actions.find(id: res.id)
      sleep(2)
  end
rescue
  #do nothing
end


res = client.droplet_actions.snapshot(droplet_id: droplet.id, name: "#{droplet.name} (#{droplet.id}) #{Time.now.strftime("%H:%M:%S %d-%m-%Y")}")
until res.status == "completed"
    res = client.actions.find(id: res.id)
    sleep(2)
end


res = client.droplet_actions.power_on(droplet_id: droplet.id)
until res.status == "completed"
    res = client.actions.find(id: res.id)
    sleep(2)
end

loop
  sleep(1000)
end

before-backup.rb

#!/usr/bin/env ruby
require 'droplet_kit'
token = 'put-your-token-id'
client = DropletKit::Client.new(access_token: token)
droplet = DropletKit::Droplet.new(name: 'bot', region: 'sfo1', image: 'backup-helper', size: '512mb')

#save droplet id

begin
  created = client.droplets.create(droplet)
  File.write('/root/droplet_id', created.id)
  until created.status == "active"
    created = client.droplets.find(id: created.id)
    sleep(2)
  end
rescue
  File.delete('/root/droplet_id')
end

snapshot-host.conf

start on startup
task
exec ruby after-backup.rb