Hi all, I want to back up my mac before I ungrade to Mountain Lion. After I do the backup, I want to ungrade my computer. What will happen, again using time machine, if I backup again after the upgrade? I know that Time Machine will automatically back up the changed or alter files. How does this relate to the operating system if I have a previous system in he original backup? Will it save both or just the upgraded system? Thanks in advance for any help.
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