title: Complete Rails app backup including external gems?
body: <p>Let's say right now I zip/tar a copy of my current Rails app directory, put it in a flashdrive and store it 10 years.</p>
  
  <p>How can I be sure that rubygems.org will be around when I try to run this application in 10 years time?</p>
  
  <p>For this reason, I wanted to know if there's a way to store a complete rails app, including all gems defined in the <code>Gemfile</code>, the databases and all files in a backup, so I'm sure I will be able to execute it in the future.</p>