Description of problem:
Failed to backup windows vm

Version-Release number of selected component (if applicable):
4.11

How reproducible:
100%

Steps to Reproduce:
1. Create windows vm with guest agent
2. Wait to guest agent to be active:
status:
conditions:
status: "True"
type: AgentConnected

3. Create backup

Actual results:
backup partially failed

Expected results:
backup complete

Additional info:
oc logs -n openshift-adp velero...

time="2022-07-31T14:54:17Z" level=info msg="stderr:

{\"component\":\"freezer\",\"level\":\"info\",\"msg\":\"Starting...\",\"pos\":\"main.go:46\",\"timestamp\":\"2022-07-31T14:54:12.836933Z\"}

\n

{\"component\":\"freezer\",\"level\":\"error\",\"msg\":\"Freezeing VMI failed\",\"pos\":\"main.go:81\",\"reason\":\"server error. command Freeze failed: \\\"LibvirtError(Code=86, Domain=10, Message='Guest agent is not responding: Guest agent not available for now')\\\"\",\"timestamp\":\"2022-07-31T14:54:17.887495Z\"}

\n" backup=openshift-adp/backup-ns hookCommand="[/usr/bin/virt-freezer --freeze --name vm-8696-1659275420-9791226 --namespace velero-test-ns]" hookContainer=compute hookName="<from-annotation>" hookOnError=Fail hookPhase=pre hookSource=annotation hookTimeout="

{30s}

" hookType=exec logSource="pkg/podexec/pod_command_executor.go:174" name=virt-launcher-vm-8696-1659275420-9791226-8hqqx namespace=velero-test-ns resource=pods
time="2022-07-31T14:54:17Z" level=error msg="Error executing hook" backup=openshift-adp/backup-ns error="command terminated with exit code 1" hookPhase=pre hookSource=annotation hookType=exec logSource="internal/hook/item_hook_handler.go:214" name=virt-launcher-vm-8696-1659275420-9791226-8hqqx namespace=velero-test-ns resource=pods