Backup all named local volumes on docker

backup.rb

folder_name = "" # Dir.pwd
volumes = %x`docker volume ls`
arr = []
volumes.scan(/local\s*(\w*)/) { |x| arr << x[0] }
arr.reject!{ |x| x =~ /^[0123456789abcdef]+$/ }
arr.each do |volume_name|
  p %x`docker run --rm -v #{volume_name}:/volume_data -v #{folder_name}:/backup ubuntu tar cvf /backup/#{volume_name}.tar /volume_data`
end

restore.rb

folder_name = "" # Dir.pwd
Dir.chdir(folder_name)
Dir.glob("*.tar").each do |filename|
  volume_name = filename[0..-5]
  %x`docker run --rm -v #{volume_name}:/volume_data -v #{folder_name}:/backup ubuntu bash -c "cd /volume_data && tar xvf /backup/#{filename} --strip 1"`
end