1. Not if you're not the kind of person who jumps on every update that comes down the pike, no.
2. No, you can't really copy Power PC to Intel directly. You'd migrate, during the first startup of the new Mac, from either the original Mac or a full SD! backup of it.
3. Just schedule it and then eject the drive. To remount when ejected, you can go into Disk Utility, select the volume and click the "Mount" toolbar button.
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--Dave Nanian
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