Zimbra Desktop backup plugin only works with Backup4all.

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Download plugin as XML file
Zimbra Desktop can synchronize mail, contacts, and calendar items with open-source mail clients such as Novell Evolution and also with proprietary clients such as Microsoft Outlook and Apple Mail. This plugin will allow backing up Zimbra settings, profiles and registry.

Raw Plugin (XML) Code: Zimbra-desktop.xml

<?xml version="1.0" encoding="UTF-8"?>
<b4asource version="1.0">
  <!--Program unique ID (GUID)-->
  <!--Program name-->
  <name>Zimbra Desktop</name>
  <!--Executable file path-->
  <exepath type="0"/>
  <!--Minimum and maximum versions for which the backup was tested-->
  <!--Information about the plugin author-->
  <!--Variables used in the XML file-->
    <!--If type="reg" then the value will be read from the registry-->
  <!--The backup sources-->
    <source name="Settings" type="folder">
      <folder>%programfiles%\Zimbra\Zimbra Desktop\data</folder>
    <source name="Profiles" type="folder">
      <folder>%localappdata%\Zimbra\Zimbra Desktop</folder>
    <source name="Registry" type="registry">
      <registry path="HKEY_CURRENT_USER\Software\Zimbra\Zimbra Desktop" recursive="true"/>