I was doing backups to an external 3.5" drive with time machine, but didn't have it formatted as a startup disk. After my HD crashed, I put in my old HD (with OS 10.4) and plugged in the external again, but holding down the Option key when booting wouldn't give me the external as a boot disk. So now I'm wondering, when I receive my replacement HD (and put 10.5 on it), if I will be able to do a full restore to what I had? I thought you had to boot from the backup disk to do a full restore? I never saw how to do it (only how to restore separate files) in Time Machine. Any wisdom greatly appreciated.