More Backups... WindowsImageBackup to a share.

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Forgot to write this down the first time, so here goes.
Steps I took to ensure writing to a Samba share worked:
Writing to an ext4 filesystem.

smb.conf share level config:
  browsable = no
  strict allocate = yes
  writable = yes
  create mask = 0700
  directory mask = 0700

I had a directory owned by just the user drwx------ windows-backup
within the share itself.

I am pretty sure the key is "strict allocate = yes" to get rid of the message:
The requested operation could not be completed due to a virtual disk system limitation.
Virtual hard disk files must be uncompressed and unencrypted and must not be sparse.
The operation ended before completion.