You are attempting to back up workgroup servers with veeam with application aware processing, however Veeam fails not being able to access the ADMIN$ share.
To disable UAC remote restrictions, follow these steps:
- Click Start, click Run, type regedit, and then press ENTER.
- Click Start, click Run, type regedit, and then press ENTER.
- Navigate to the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
- Create a new DWORD 32-Bit Value called LocalAccountTokenFilterPolicy
- Set the value to 1.
In my experience, you do not have to reboot.