MS Office files backup plugin only works with Backup4all.

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Download plugin as XML file Author: Adrian (Softland), 2021-06-17
This plugin will allow adding as backup sources only Microsoft Office files, such as: xlsx, doc, docx, xls, onepkg, ppt, pptx, pptm, docm, rtf, xlsx, xlsb, accdb and pub.

Raw Plugin (XML) Code: MS-Office-files.xml

<?xml version="1.0" encoding="UTF-8"?>
<b4asource version="1.0">
  <!--Program unique ID (GUID)-->
  <!--Program name-->
  <name>MS Office files</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-->
    <variable name="varP15WRTJW75007" type="reg">HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders\Personal</variable>
  <!--The backup sources-->
    <source name="My Documents" type="folder">
      <include type="fullpath">*.doc</include>
      <include type="fullpath">*.docx</include>
      <include type="fullpath">*.xls</include>
      <include type="fullpath">*.xlsx</include>
      <include type="fullpath">*.onepkg</include>
      <include type="fullpath">*.ppt</include>
      <include type="fullpath">*.pptx</include>
      <include type="fullpath">*.pptm</include>
      <include type="fullpath">*.docm</include>
      <include type="fullpath">*.rtf</include>
      <include type="fullpath">*.xlsm</include>
      <include type="fullpath">*.xlsb</include>
      <include type="fullpath">*.accdb</include>
      <include type="fullpath">*.pub</include>