Also, apart from using Veeam as a backup tool, you can utilize this software as a migration utility, as well.
There is a functionality called Quick Migration that is included in Veeam Free edition. Using it, you can migrate with minimal disruptions one or more VMs between ESX(i) hosts (with different CPU types), datastores or both.
Taking into account sensitive nature of Cisco Applications, I would backup/migrate VMs that runs them in powered of state.
Cheers.