[wdfifteen]

I'm getting conflicting information. One source says you cannot restore to the box's pre-upgrade state. Apparently you can recover your files, but not the old OS. True? I have hourly Time Machine backups and could go back to this morning, but it wouldn't do any good if it doesn't restore the old OS.
Another source says restore from Time Machine erases the disk and restores your computer to its state at the selected time. If that is true all I have to do is a restore.