My case is 02200179 and we have identified a minor bug.
this is support reply
Indeed, there was some extra debug logging enabled, which is stored in C:\Windows\System32 instead of proper logs folder. This will be fixed in one of the future updates.
The way to disable this now is by adding the following registry key to Veeam server:
1. Create a DWORD value named DisableProxyClientLogging and set it to 1, under HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Backup and Replication\
2. Ensure that no jobs are running, and restart Veeam Backup Service.