<project>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-resources-plugin</artifactId>
        <version>3.2.0</version>
        <configuration>
          ...
          <escapeString>\</escapeString>
          ...
        </configuration>
      </plugin>
    </plugins>
    ...
  </build>
  ...
</project>