I tried to backup my entire WHS11 to a large external hard drive and found out that backing up to a drive over 2TB is against the rules!
So, a little research later I found this: https://social.microsoft.com/Forums/en-US/c0c0ecb1-7d48-4eb7-8c7f-7abea3794328/client-backups-and-server-backups-over-2tb
Long story short, add a QWORD to the registry in the following place:
To remove the 2TB limit in the backup wizard.
HKLocalMachine\Software\Microsoft\Windows Server\Server Backup
QWORD MaxVolumeSize = n
N is some number larger than your volume size. 2TB is 0x1FDFFE00000 or 2190431223808 bytes
I used 21904312238080, so that should be good for a 20ish gig drive.
I don't know if it works yet, but I got farther than I did before. WHS let me setup and begin the backup. It's running now. With any luck it should complete successfully, we'll see.
I don't get that if this was identified all the way back in 2011, why do I have to modify my registry in 2015. Kind of like how WHS2011 still needs the UEFI hotfix run manually. Can't this be a windows update?
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