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The Windows 8 Developer Preview edition includes its own hypervisor, which allows you to create virtual machines that can run other versions of Windows. You can install virtual copies of Windows XP, Vista, or Windows 7 for backward compatibility and testing. Or you can install a virtual copy of Windows 8 to experiment without putting your main Windows 8 installation at risk.
Hyper-V is turned off by default. To enable it, enter Features in the Search box, click Settings, and then click Turn Windows features on or off from the results list. That opens the dialog box shown here.
Click to select Hyper-V and its components, and then click OK. That installs the necessary components, and you can now use the Hyper-V Manager to create a new virtual machine or import an existing one and begin working with it.
File History consolidates the Windows 7 backup program and the Previous Versions feature into a single tool that automatically keeps backups of your important files, typically on an external disk drive. If this feature is enabled, you can recover a deleted file or restore a previous version of a file very easily.
One of the options available when you plug in a new USB flash drive or external hard disk is Configure this drive for backup using File History. You can enable or disable these automatic backups and fine-tune what's backed up from this desktop Control Panel window.
This Advanced Settings dialog box offers some very important backup options for the File History feature. In particular, you can change the amount of time for which old versions are saved and how often snapshots are taken.
By default, backed-up versions are saved forever, and fresh copies are snapped every hour. If you set up a network share as the default location for saving File History and then click Recommend this drive, anyone in your homegroup will be able to use that location as a backup target.