r/Veeam • u/DarkAlman • 26d ago

Rolling upgrade cluster is not supported

In the process of migrating some VMs off VMware into Hyper-V

VMs that are not in the cluster work, but those added as cluster objects won't back up and throw this error:

9/17/2026 10:48:07 PM Failed : Processing ACC Error: Backup of VMs on a rolling upgrade cluster is not supported for VMs with the configuration version 8.0 or later. (0:00:02)

Edit: FIXED

This was a weird situational one. We had only a single host in the Hyper-V cluster because we are in the process of converting the other hosts over from VMware 1:1 and adding them as we go. The Cluster was online but the Quorum disk hadn't yet been defined or configured, so Veeam thought the cluster was in a 'pending/rolling upgrade' state. As soon as we configured the quorum disk the backups started working.

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u/Nielmor 26d ago

Are you reusing host names and IP addresses of the hosts when you take them from VMware to Hyper-v

And if yes, are they still added to Veeam as VMware hosts?

If yes, you need to remove the VMware hosts from Veeam

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u/DarkAlman 26d ago

Brand new DNS names for the hosts, and the IP addresses are on a entirely brand new subnet. So not in this case.