If encountering a warning on Veeam Backup & Replication version 6 or 7, this issue is typically caused by Veeam not able to freeze the guest machine in order to take hot backup.
Others also experience slow veeam jobs and manual snapshot consolidation and deletion.
The solution is to edit the Veeam Backup Job in your Veeam Backup & Replication software and recalculate the virtual machines. To do this:
1. Open Veeam Backup & Replication
2. Right click on backup job
3. Click on edit
4. Click on Next
5. Click on Recalculate, this will recalculate virtual machine disks and register with veeam database.
6. Click Finish to exit.
You should experience faster backup jobs and no more warnings.