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  <li class="toctree-l2 current"><a class="current reference internal" href="">Version Control</a></li>
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    <div class="section" id="version-control">
  <h1>Version Control<a class="headerlink" href="#version-control" title="Permalink to this headline">¶</a></h1>
  <p>ownCloud supports simple version control for files. Versioning creates backups
  of files which are accessible via the Versions link. This link contains the
  history of the file where you can roll back a file to any previous version. Changes
  made at intervals greater than two minutes are saved in data/[user]/versions,
  and made accessible using the above pages.</p>
  <p>To restore a specific version of a file, hover your cursor on a file and click
  <em>Versions</em> link. If any version is available, you should see a list like the image
  below:</p>
  <div class="figure">
  <img alt="../_images/files_versioning.png" src="../_images/files_versioning.png" />
  </div>
  <p>Clicking on <em>Restore</em> next to any version will revert the file to that
  version back.</p>
  <p>The versioning app expires old versions automatically to make sure that
  the user doesn&#8217;t run out of space. Following pattern is used to delete
  old versions:</p>
  <ul class="simple">
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  <li>For the first second we keep one version</li>
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  <li>For the first 10 seconds ownCloud keeps one version every 2 seconds</li>
  <li>For the first minute ownCloud keeps one version every 10 seconds</li>
  <li>For the first hour ownCloud keeps one version every minute</li>
  <li>For the first 24 hours ownCloud keeps one version every hour</li>
  <li>For the first 30 days ownCloud keeps one version every day</li>
  <li>After the first 30 days ownCloud keeps one version every week</li>
  </ul>
  <p>The versions are adjusted along this pattern every time a new version gets
  created.</p>
  <p>Beside that the version app takes care to never use more that 50% of the users
  currently available free space. If the stored versions exceed this limit ownCloud
  delete the oldest versions until it meets the memory usage limit again.</p>
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