I have a new Windows Server 2012 r2 environment that is a domain. I have 3 VM's running on the host. The host has a VHDX attached to a NAS that is used for backup of the machine, except for the VM's which I didn't want to backup from the host since one of them is running Exchange 2013 and I didn't want to stop receiving email during the backup process. The host backup runs fine, without an admin being logged in. I logged into the Exchange Guest, created another VHDX on the same NAS (in a different folder) and setup backup on the guest. When I manually run backup on the guest it is successful. When I schedule it, I get notification that it is started, but it never completes. When I look at the logs, I get an indication that the backup drive is offline. More digging tells me that the volume is not available. Is there some setting that I need to enable to allow this connection to remain even when I log off?