Are you planning to build Veeam 13 environment on appliances only?
Veeam 13 offers backup environment via appliances. VBR and VEM via VSA appliance and proxy with gateway servers via VIA appliance.
Hmm, probably you need to consider windows component in backup environment. Of course if you are planning functionality of backup environment like:
- FLR for Windows Server
- Application backup
- Guest Interaction Proxy
- Log Shipping Server
- Item-level Restore
FLR for Windows Server
It is needed to define Windows “Mount Server” for repository.

Guest Interaction Proxy
Based on KB is not possible to use appliance, but RHEL/Rocky server with installed: libmsi1, samba-client, and samba-common-tools - for efficiency we will use windows server.
You can see, that via appliance is not possible via RPC due missing packages.

Log Shipping Server
Log shipping server for MS-SQL requires windows managed server only.

Oracle Log Shipping Server
Log shipping server for Oracle requires windows managed server only.

PostgreSQL
Log shipping server for PostgreSQL requires windows managed server only.

So if you are planning backup environment, it is needed to consider at least one windows server for all these roles.
Of course service account is not required. Communication with appliances could enabled via deployment kit from console, what is described in my blog.
