Exporting User Data
One of the General Data Protection Regulation’s (GDPR) tenets is that Users have a right to data portability.
Data portability means that users have the right to receive their personal data in a machine-readable format.
The Control Panel’s User Management system natively supports the export of a User’s personal data to a ZIP file for download. The format is in XML format.
Exporting and Downloading
To export user data,
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Open the Global Menu (  ). ).
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Go to Control Panel → Users → Users and Organizations. 
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Find the User and click Actions (  ), then click Export Personal Data. ), then click Export Personal Data.This opens the User’s Export Personal Data screen. 
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If there are no existing export processes shown, click the Add button (  ). The tool for exporting the User’s data appears. ). The tool for exporting the User’s data appears. 
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Most of the time you want to export all the available data. Click Select Items, and all applications containing User data are selected in the UI. 
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Click Export. You’re taken back to the User’s Export Personal Data screen, but now there’s an export process in the list.  
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Download the data. Click Actions (  ) for the process and select Download. ) for the process and select Download.
Examining Exported Data
The exported data looks like this:
<?xml version="1.0"?>
<model>
    <model-name>com.liferay.message.boards.model.MBMessage</model-name>
    <column>
        <column-name>messageId</column-name>
        <column-value><![CDATA[38099]]></column-value>
    </column>
    <column>
        <column-name>statusByUserId</column-name>
        <column-value><![CDATA[38045]]></column-value>
    </column>
    <column>
        <column-name>statusByUserName</column-name>
        <column-value><![CDATA[Jane Slaughter]]></column-value>
    </column>
    <column>
        <column-name>userId</column-name>
        <column-value><![CDATA[38045]]></column-value>
    </column>
    <column>
        <column-name>userName</column-name>
        <column-value><![CDATA[Jane Slaughter]]></column-value>
    </column>
    <column>
        <column-name>subject</column-name>
        <column-value><![CDATA[Great list. I was thinking of bringing the family,...]]></column-value>
    </column>
    <column>
        <column-name>body</column-name>
        <column-value><![CDATA[<p>Great list. I was thinking of bringing the family, but I don't
  actually believe humans have ever been to the moon, so I guess it
  would be silly to book a trip! LOL!</p>]]></column-value>
    </column>
</model>
In this example, User Jane Slaughter made a Message Boards Message post, and her User information was recorded in the MBMessage model’s database table.
This actually corresponds with a comment on a Blogs Entry:

Exporting User data informs Site Owners and Users about how much personal data the Site contains.