Backup Microsoft Virtual PC files

Back up all of your Virtual PC files. In the unlikely event that your installation becomes corrupted, you can restore the files from these backups. The files to back up include:

Virtual PC configuration file (Options.xml)

Virtual machine configuration (.vmc) files

Virtual hard disk (.vhd) files

Undo disk (.vud) files 

By default, Virtual PC creates the virtual machine configuration (.vmc) files, virtual hard disk (.vhd) files and undo disk (.vud) files in My Documents\My Virtual Machines. Virtual PC stores Virtual PC configuration files (Options.xml) in %userprofile%\Application Data\Microsoft\Virtual PC.