Veeam General

Error: “Failed to prepare guest for freeze, wait timeout 900 sec.”

Veeam server registry key: “HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Backup and Replication”

Add DWORD (32-bit) value named “VssPreparationTimeout”.

The value is in milliseconds (decimal).

https://www.veeam.com/kb1377