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Things to note regarding virtual machine backups:

  1. Mac: time machine does not backup virtual machine files.
  2. A virtual machine image is actually comprised of several files.  All of those have to be in sync or behavior is erratic.
  3. From outside the virtual machine (host machine), if a backup is made when the virtual machine is running, the results are inconsistent.  Backup your virtual machine files on the host machine when the virtual machine is not running.
  4. To backup virtual machines using Mac OS X 10.5's Time Machine, users will need to be running Mac OS X 10.5.2 or later.  When backed up using Time Machine, virtual machines are duplicated and may take up considerable space on your backup drive.

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