How to override some files

I’m trying to override the next files:

• vendor/magento/module-backend/Block/Dashboard/Sales.php
• vendor/magento/module-reports/Model/ResourceModel/Order/Collection.php

What path I need to create in a Module to override those files?

I tried

• app/code/Vendor/Module/Block/Dashboard/Sales.php
• app/code/Vendor/Module/Magento_Backend/Block/Dashboard/Sales.php
• app/code/Vendor/Module/Model/ResourceModel/Order/Collection.php
• app/code/Vendor/Module/Model/Magento_Reports/ResourceModel/Order/Collection.php

none work.

Thanks