I'm attempting to upgrade my backup server from Windows Server 2008 R2 Enterprise to Windows 2012 R2 Datacenter. I've attempted the upgrade twice so far and have, most likely, corrupted the process myself thru impatience! The process runs it's course and everything appears to be working but it's running for over 2 days and, after 1 full day of seeing "Preparing to Start" (or something to that effect), I get impatient and force a reboot which ends up telling me that the "upgrade failed"....Has anyone performed this upgrade successfully? If so, can you let me know if it typically takes more than 2 days and whether or not I should try it again with a little more patience. Thanks!