I have a W2K8 R2 server that has been running for about 2 years with no issues. Last week, Windows Server backup began hanging the server so that only a power cycle of server will get it working again. I have tried changing the backup destination, the cable to the external drive and the interface to it on the server. This is a DC with Exchange. Customer decided to add Exchange after they said they didn't need. There are no logs written to help explain why the server hangs. Any help would be greatly appreciated.