Testing Bootable USB - missing operating system This is what I do to invoke the bootable USB - turn computer on > press F12 to invoke the Boot Menu > Select USB device (the only one connected at the time) > Hit Enter to select the device > "Missing operating system" - It is almost like Cloudberry Backup does not place a boot file in order to load the OS.
I used another new USB drive and made another Bootable USB using Cloudberry backup. Same result.