How to format a GUID Disc to APM:
Open Disc Utility. Select the disc to be re-formatted. Select Partition, choose the desired number of partitions (which can be 1), then options. The options dialog will allow you to select the type of format: GUID, APM, or Master Boot Record, and will show information regarding which format will work as a start-up disc on Intel and PPC systems. (Note: The options button remains grayed out until you select a number of partitions.)
Nice.
Further references for creating a dual (Intel [I]and[I] PPC) bootable SuperDuper backup include these two excellent references:
http://www.maccast.com/2006/11/03/pp...uper/#more-784
http://www.macosxhints.com/article.p...06061610374449
...JB