To export your comments login to your Disqus Admin, then navigate to Tools -> Import/Export, and click Export.

Export Format (XML)

XML Schema Definitions are available for new-style exports. The current version can be viewed at http://disqus.com/api/schemas/1.0/disqus.xsd

Example output

<?xml version="1.0"?>
<disqus xmlns="http://disqus.com"
        xmlns:dsq="http://disqus.com/disqus-internals"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://disqus.com/api/schemas/1.0/disqus.xsd
                            http://disqus.com/api/schemas/1.0/internals.xsd"
>

<!--
  Categories must be declared at the top of a file. They only need declared once
  per site, and DISQUS will attempt to validate them against existing data if they
  are not present in the XML.

The `dsq` namespace is for internal usage by DISQUS and tends to hold things such
  as internal identifiers for objects.

- `title` must be unqiue per `forum`
  -->
  <category dsq:id="1">
    <forum>disqusdev</forum>
    <title>Technology</title>
  </category>

<!--
  Threads must be declared after categories, and before posts. They only need declared once
  per site, and DISQUS will attempt to validate them against existing data if they
  are not present in the XML.

The `dsq` namespace is for internal usage by DISQUS and tends to hold things such
  as internal identifiers for objects.

- `id` must be unqiue per `forum`
  -->
  <thread dsq:id="2">
    <id>1</id>
    <forum>disqusdev</forum>
    <category dsq:id="1"/>
    <link/>
    <title/>
    <message/>
    <createdAt>2012-12-12T12:12:12</createdAt>
    <author>
      <name>Baz</name>
      <email>foo@bar.com</email>
    </author>
  </thread>

<!--
  Posts must be declared in a standard tree order. Parents should always exist before
  they are referenced. DISQUS will attempt to validate them against existing data if
  they are not present in the XML.

The `dsq` namespace is for internal usage by DISQUS and tends to hold things such
  as internal identifiers for objects.

- `id` must be unqiue per `forum`
  -->
  <post dsq:id="1">
    <id>2</id>
    <message>Mother Russia</message>
    <thread>1</thread>
    <isSpam>true</isSpam>
    <createdAt>2012-12-12T12:12:12</createdAt>
    <ipAddress>127.0.0.1</ipAddress>
    <author>
      <name>Baz</name>
      <email>foo@bar.com</email>
    </author>
  </post>
  <post dsq:id="2">
    <id>1</id>
    <message>Yo dude</message>
    <parent dsq:id="1">2</parent>
    <thread>1</thread>
    <createdAt>2012-12-12T12:12:12</createdAt>
    <ipAddress>127.0.0.1</ipAddress>
    <author>
      <name>Baz</name>
      <email>foo@bar.com</email>
    </author>
  </post>
  <post>
    <id>3</id>
    <message/>
    <thread dsq:id="2"/>
    <createdAt>2012-12-12T12:12:12</createdAt>
    <ipAddress>127.0.0.1</ipAddress>
    <author>
      <name>Baz</name>
      <email>foo@bar.com</email>
    </author>
  </post>

</disqus>