Increasing the size of Hyper-V virtual disk on Win 2008 R2

I had to increase the size of a virtual machine on a Windows 2008 R2 host.  I'd go to the settings of the VM and click on "edit" would be greyed out when attempting to edit the hard drive size.  It looked like this.

I needed to do three things to resize the disk:
1) shut down the VM
2) Delete all the snapshots of the VM
3) Let the VM merge itself to all previous snapshots - see this

It can take minutes or hours for the merge (#3 above) to take effect.

After the merge has taken place, you can increase the size of the disk and then you'll need to extend the size of the hard drive within Windows of the VM:

SBS 2008 backups limited to volumes 2 TB in size

In setting up an SBS 2008 box today, I was creating the backup routine - and got the error message "cannot configure backup schedule" - when creating the backup routine in the Windows SBS Console.

Long story short, apparently - there can be trouble if you have a Win32 formatted disk on your server. You can fix that with "convert d: /FS:NTFS" However, apparently, that error only exists when you use the SBS Console. If you use Windows Server Backup Console, you can back up Win32 formatted volumes.

But that wasn't my problem today. I got that error above, but when I ran the Windows Server Backup Console, it told me that my volumes had to be 2 TB minus 4 GB. Apparently, this is a universal limitation, not related to the fact that I have two 2 TB WD external HDs as backup for the server. But I had a 3.3 TB partition that came from the Dell factory.

So the solution was to use resize the partition, which was super easy. Go to disk management, right click on the drive that is too large and choose shrink volume. It'll let you reduce the size of the partition and allocate the space you got rid of as unallocated space and you can just create a new partition.