Once downloaded, upload the file to your WHMCS Addon modules folder, and unzip the file.
Full path after unzip: “modules/addons/backupmanager“.
* Remove the uploaded zip file.
* If you are uploading the files as root user, don’t forget to change owner & permissions *
Login to your WHMCS as admin user, and navigate to “Setup” -> “Addon modules“.
Find the “Backup Manager” module, and activate it.
Set access control, Save your changes and your module is all set.