Backup error on VM guest using veeam backup

I have problem when backup a vm using Veeam backup these few days. It returns with

Error: An error ocurred while saving the snapshot: Failed to quiesce the virtual machine.

Any idea ?

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If you Take a Snapshot manually, using the and Tick the Quiesce option, does it also fail ?

Has this just started to fail, or has it always failed.
AXISHKAuthor Commented:
It is ESXi VM5.5. It only happen recently. .... Tks
noxchoGlobal Support CoordinatorCommented:
Try to reinstall the VMware Tools on this machine. Then restart the VM and try to do the backup again.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Please confirm if manual snapshot fails, and re-try the backup.
Alessandro ScafariaInfrastructure Premier Field AdministratorCommented:
AXISHK, are you using Veeam free or paid edition? What version number?

In your environment, did you have other VMs to backup? Are they failing too?
AXISHKAuthor Commented:
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