It is always good idea to verify that your vCenter Server Appliance (VCSA) backups are occurring and if there are any failures, you are notified about them immediately!
As alluded to at the end of that blog post, you can easily build event-driven automation using the popular VMware Event Broker Appliance (VEBA) solution, triggering notifications based on several types of VCSA backup events:
I recently built a PowerShell function that would send a notification to a Google Chat space by enabling their incoming webhook integration as you can seen from the screenshot below:
While the message customization is not as extensive as using Slack (e.g. supporting advanced layouts and emoji), it does get the job done and you will know immediately when a backup has failed or when it has started or has completed.
Note: For existing VEBA users (pre-v0.8 release), the function.yaml needs to be updated to trigger off of the subject keyword rather than the type, which is due to replacing the event router with Tanzu Sources for vSphere. You also need to ensure the prefix of "com.vmware.vsphere" is removed along with trailing "v0" as this is the next syntax for vCenter Events once VEBA v0.8 is released.
spec: broker: default filter: attributes: subject: com.vmware.applmgmt.backup.job.failed.event