Using backup gem in rails project with separate Gemfile

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Note: the full file names are config/backup/Gemfile and config/deploy.rb, which gist.github.com can't handle ;-)

Of course, you will need a backup config file, preferrably in config/backup/config.rb, and you need to trigger the backup from cron (check out the whenever gem if you want that behaviour bundled with your rails app).

In both files, you need to take the locations of stuff (rails root, backup config file) into consideration.

configbackupGemfile

source 'http://rubygems.org'

# your exact requirements depend on the way you use backup and the version of the backup gem.
# Be sure to have a look at https://github.com/meskyanichi/backup/blob/master/lib/backup/dependency.rb
# at the relevant version!

gem 'backup',    '3.0.24'
gem 'fog',       '~> 1.1.0'
gem 'mail',       '~> 2.4.0'

configdeploy.rb

...

after "deploy:update_code", "deploy:bundle_for_backup"

namespace :deploy do
  task(:bundle_for_backup) do
    run "cd #{release_path}/config/backup && bundle install --quiet --deployment"
  end
end