title: Zip local files prior to an update with Inno Setup
body: <p>When running new releases of my installer I would like to make a backup of an existing installation by adding files into a ZIP archive.</p>
  <p>Currently, I am able to make a backup of an existing installation by coping the files to my <code>Backup</code> destination.  A simplified version of the method I use is as follows:</p>
  <pre><code>[Files]
  ; Copy the contents of Bin folder to Backup folder. Skip if files don’t exist. 
  Source: {app}\Bin\*;  DestDir: {app}\Backup\; \
      Flags: createallsubdirs external recursesubdirs uninsneveruninstall skipifsourcedoesntexist;
  </code></pre>
  <p>I would appreciate any ideas how I can zip instead?</p>