Hello @Siva Thank you for reaching out to us!
Azure backup flow is documented here - https://learn.microsoft.com/en-us/azure/backup/backup-architecture
You can use Azure backup reports - https://learn.microsoft.com/en-us/azure/backup/configure-reports to view details of Azure backup jobs (success/failure)
Logs for troubleshooting Azure VM backup depends on the type of OS you are backing up Azure. See the troubleshooting guides below:
https://learn.microsoft.com/en-us/azure/backup/backup-azure-vms-troubleshoot
https://learn.microsoft.com/en-us/azure/backup/backup-azure-troubleshoot-vm-backup-fails-snapshot-timeout
Hope this helps. Feel free to ping with questions for further assistance.