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  <section id="server-side-encryption-migration">
<h1>Server-side encryption migration<a class="headerlink" href="#server-side-encryption-migration" title="Link to this heading"></a></h1>
<section id="encryption-format">
<h2>Encryption format<a class="headerlink" href="#encryption-format" title="Link to this heading"></a></h2>
<p>Nextcloud still supports the legacy encryption scheme used for server side encryption where the encrypted files did not contain header information. This may still be used for installations that still have encrypted files from &lt;= ownCloud 6. Files will be updated to the new encryption format once they are written again. However it is recommended to check if you have to still support this scheme.</p>
<p>Starting with version 20 for new installations the legacy encryption will be off by default.
However if you are upgrading there is a migration path to check if you can disable legacy encryption.</p>
<section id="checking-for-old-files">
<h3>Checking for old files<a class="headerlink" href="#checking-for-old-files" title="Link to this heading"></a></h3>
<p>On the command line run:</p>
<blockquote>
<div><p>occ encryption:scan:legacy-format</p>
</div></blockquote>
<p>The command will tell you if you can remove the legacy encryption mode.
If so set the <cite>encryption.legacy_format_support</cite> in your config.php to ‘false’.</p>
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