# Veeam

# Backup Failed: Agent failed to process method {ReFs.SetFileIntegrity}.

### <span class="C9DxTc">Error</span>

<span class="C9DxTc">When running a backup job you receive the following error:</span>

<span class="C9DxTc">Processing \[SERVER NAME\] Error: Incorrect function. Agent failed to process method {ReFs.SetFileIntegrity}.</span>

### <span class="C9DxTc">Fix</span>

<span class="C9DxTc">Run this to disable fast clone:</span>

> <span class="C9DxTc">New-ItemProperty -Path 'HKLM:\\SOFTWARE\\Veeam\\Veeam Backup and Replication\\' -Name 'UseCifsVirtualSynthetic' -Value '0' -PropertyType DWORD -Force</span>

<span class="C9DxTc">To undo fix:</span>

> <span class="C9DxTc">Remove-ItemProperty -Path "HKLM:\\SOFTWARE\\Veeam\\Veeam Backup and Replication\\" -Name "UseCifsVirtualSynthetic"</span>

<span class="C9DxTc">Ref: </span>[<span class="C9DxTc aw5Odc">https://www.veeam.com/kb4381</span>](https://www.veeam.com/kb4381)