Backup Technology: Veeam Sometimes Veeam backup jobs failed on VM with below error message continuously. Failed to prepare guest for host backup. Error: VSSControl: Failed to prepare guest for freeze, wait timeout 900 sec Error: VSSControl: Failed to prepare guest for freeze, wait timeout 900 sec We need to follow the below steps to resolve the issue. Cause: This issue typically involves a very active transactional application running in the virtual machine, and it is taking longer than expected per the default timeout to freeze the I/O for this application/VM Solution You can change this timeout by modifying the value in the registry of the server where Veeam Backup & Replication is installed as follows: 1. Go to Veeam registry path HKEY_LOCAL_MACHINE\SOFTWARE\VeeaM\Veeam Backup and Replication. 2. Add a DWORD (32-bit) value named VssPreparationTimeout. The value is in milliseconds (decimal), the default timeout is 900000, which equa
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