The agent snapshot is failing almost immediately after the "Determining data to send" stage.
The error message is "System.IO.EndOfStreamException".
In AppRecoveryPM.log of the agent, we get these errors "Failed to read some of disk '\\.\PhysicalDrive0' metadata sectors. This can result in problems with VM export later."
The agent is a Windows Guest VM on a KVM host.
Windows Guest VM on a KVM guest requires correct virtio drivers for the virtualized disk to be read correctly.
In this case, there are some unreadable sectors on the virtualized disk due to outdated/incorrect virtio drivers.