How to snapshot (backup) Mirage volumes?

Hello folks,

I am reading this article regarding best practices for upgrading Mirage and it mentions backing up or snapshot the Mirage volumes using image block based backup method.

Does anyone have an example of how to do that and what tools to use?

https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2031711

Thanks,

romatlo32