Hello @Rajasekar K ,
Thank you for sharing the details. From the error messages, it is clear that the VM guest agent is not running/unreachable. For azure backup/site recovery to progress, we need the guest agent as prerequisite.
If this is a windows VM, then from Services.msc, ensure the Windows Azure Guest Agent service is Running. If the Windows Azure Guest Agent service is missing, Install the VM agent on the VM
Ensure that the VM Agent (WA Agent) up and running and is the latest version.
You can check if the guest agent is running from the overview page of the VM blade like below
ASR Troubleshooting Guidelines : https://learn.microsoft.com/en-us/azure/site-recovery/site-recovery-extension-troubleshoot#the-agent-installed-in-the-vm-but-unresponsive-for-windows-vms
Azure VM Backup: https://learn.microsoft.com/en-us/azure/backup/backup-azure-vms-troubleshoot#basic-troubleshooting
Hope this helps!
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