When backing up a Windows server, VSS fails.
You receive the following error when backing up a Windows Server:
Indexing guest file system Failed to perform index: guest OS 'otherGuest' is not supported
Freezing guest operating system Failed to perform Veeam VSS freeze: guest OS 'otherGuest' is not supported
VMware tools do not recognize guest OS and mark it as OtherGuest.
To address, use Registry Editor and add the following entry:
HKLM\SOFTWARE\VeeaM\Veeam Backup and Replication\
DWORD = 1