I have the similar Problem such as many other users with the backup programm but:
- i have a Windows 7 System as Backup-Target (No NAS !!!!)
- i cannot backup over VPN but when i do it local to the same Windows 7 machine, everything is OK
The VPN runs perfectly. I can copy big files without Problems (bandwith is 10 MBit/s). I can do the Backup per Windows Server Backup or per wbadmin - the result is the same. I will make a Bare Metal Recovery Image.
Where is the problem ? The only differences between local backup and VPN-backup is the smaller bandwith and the higher latency.