I try to back up QnE Optimum from a client workstation, system prompted "backup failed - the path is not of a legal form"
You need to have at least a share folder in your server for QNE Optimum to transfer the file using this folder, You can perform the below to share a folder in the server:
1. Login to the server
2. create a folder in your C drive, e.g. Share
3. right click to Share with>Specific People and select "Everyone"
4. Go back to the workstation and try to backup again.