This Veeam Backup & Replication use email and not Powershell snippet. It is as efficient (or more) as other method of integration with Zabbix and it requires a lot less ressources. It monitors even Backup Database backup (which others do not).

Using a specific script it can be applied to Free Agents as well.

It uses zbxsmtptrap  (on an idea from here : https://www.zabbix.com/forum/showthread.php?p=186838)

https://github.com/sibiodev/zbxsmtptrap

Give it a try!

PS: to use this script with Veeam Free Agents without a VBR server (if you use a VBR server with a Free Agent, then you do not need this script because VBR will report by email to you), you'll need this small script to send the email :

https://github.com/sibiodev/veeamrun