Hello.
As a first step there is a very good number of Software providers for backup of a virtual infrastructure, such as Veeam (https://www.veeam.com/)
For a Free backup of the VMs, I attach a couple of interesting links
Enrique Espinel
Senior Technical Support on IBM, Lenovo, Veeam Backup and VMware vSphere.
VSP-SV, VTSP-SV, VTSP-HCI, VTSP
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