When the backup command has finished, it is possible to boot Mac OS 9 and Mac OS X from BackupDisk. Before starting the backup, verify that "privileges" are honored on the BackupDisk. Otherwise all files of the backup are owned by the currently logged in user, and the backup becomes worthless. To check the privileges settings, open the Info window for the BackupDisk in the Finder and switch to the Privileges pane. Then uncheck the "Ignore privileges on this volume" checkbox. (With the command line, you can check or modify this settings with the vsdbutil command. "sudo vsdbutil -c /Volumes/BackupDisk" shows the current privilege settings, "sudo vsdbutil -a /Volumes/BackupDisk" lets the system honor the privileges on the disk and "sudo vsdbutil -d /Volumes/BackupDisk" makes the system ignoring the privileges.)
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