It wasn't a VirtualBox limitation, but an OS X... I know that VMWare won't let me create a VM of 10.6 unless it is from 10.6 Server install media.

Qubes OS defines itself modestly as "a reasonably secure operating system." It might actually be one of the safest operating systems, often used by pros who are most concerned with computer security.

The MacApper weblog has a simple, beginner's tutorial for creating and using virtual disks on your Mac using the built-in Disk Utility. As MacApper explains, Disk Utility allows you to back up a ...

Make a macOS installer with createinstallmedia and install Monterey or another macOS on multiple Macs, do a clean install, or access a faulty Mac.