Hi Hector,
Thank you for your submssion. GCE group is a place where we open all kinds of discussion on our platform and infrastructure regarding GCE.
Compatability related issues with a partner's 3rd Party Backup solution like Cloudberry [1] or commenting on their competitor is out of scope for this kind of forum.
To get started with your specific backup needs, I'd recommend starting in our cloud documentation for Backup solutions proposed by GCP [2]. You could also contact the Vmware support support team to discuss workarounds. [3] Serverfault, in the Stack Exchange Network is a great place to post this type of questions and you may find in their question history ways to backup your Vmware ESXi instances. [4]
I hope that helps and thank you for understanding.