Can I mix PowerPC & Intel on my external hard drive?

I have a PowerPC iMac G4 using Tiger, and a MacBook Pro Intel using Snow Leopard. I have a single large external drive. I want to partition the drive so that I can back up from both computers on the drive. I would like to use SuperDuper to clone those computers, so that in the event one of them goes belly up, I can start up from the external drive.
From what I've read, PowerPC requires Apple Partitioning Mode, and Intel uses GUID, but might work with APM. If I partition my drive using APM, would I be able to start up from the external drive the Intel/Snow Leopard partition?
Or, is startup not necessary? For example, if one of the computers won't work, I could just transfer everything to a new computer? I'm not sure which is the best way to go here.

catservants wrote:
I have a PowerPC iMac G4 using Tiger, and a MacBook Pro Intel using Snow Leopard. I have a single large external drive. I want to partition the drive so that I can back up from both computers on the drive. I would like to use SuperDuper to clone those computers, so that in the event one of them goes belly up, I can start up from the external drive.
From what I've read, PowerPC requires Apple Partitioning Mode, and Intel uses GUID, but might work with APM. If I partition my drive using APM, would I be able to start up from the external drive the Intel/Snow Leopard partition?
yes, you should be able to. try it to make sure the intel mac boots from the superduper clone on that drive. you can not install OS X on an APM partitioned drive from an intel mac but you can clone to one and boot from it. make sure that the external has firewire interface. a PPC mac won't boot from a USB drive.
Or, is startup not necessary? For example, if one of the computers won't work, I could just transfer everything to a new computer?
yes, using Migration assistant. you can not use MA to migrate from 10.6 to 10.4 but you can to migrate from 10.4 to 10.6.
I'm not sure which is the best way to go here.

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