Future compatibility of Mac HFS with new external HD

Hi,
I have a PPC imac G5 with OSX10.4.8 and new external HD-My Book 320 in Fat32-which I'd like to use as a bootable back up.
1.Do I have to reformat to Mac HFS to make it a bootable HD?
2.Will the Mac disk utilities work if it remains as FAT32 formatting?
3.Most importantly-if formatted to Mac HFS will this cause an issue years later when Mac has forgotten about PPC owners, and I try to transfer all this data to a new intel mac? Or is there no conflict possible?
4.To zero out or erase a 320GB prior to an HFS formatting means the computer will be unusable for how long as it erases? (roughly)
Thanks in advance for any answers!!
Scott
G5 Mac OS X (10.4.6)

Scott,
Is it firewire? If not, it won't want to boot your iMac G5.
1. Yes.
2. Please flesh out the question. Will disk utilities work to do what?
3. a. Macs will contintue to read HFS+.
b. The boot issue with Intel Macs has to do with the different
processors and the differences between booting EFI vs. Open
Firmware. The volume structure is different. The files
will be readable.
c. You will not, however, want to try to use PPC programs in an
Intel Mac. Classic and associated programs are also specifically
not supported.
4. You can continue to use the computer normally while it's zeroing
the external drive.
-Wayne

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I recently bought a 160 GB external USB 2.0 drive to
use with my iBook G3 (900 40 GB HD 14” screen) and it
seems to have wacked out my USB ports. One simply
isn’t working at all. Through the other, I use a USB
hub to plug in my drive and other USB devices. I have
the drive partitioned into a backup, a folder for my
iTunes music, and one general purpose partition. The
icons don’t always show up on my desktop without
restarting and when they are there, sometimes they
just blip out for no apparent reason.
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ibond

Your post on -9972 was very helpful. Thank you.
In the meantime I bought another enclosure (Macally PHC-500BC) and installed the same firmware 4.73 and tried to use it.
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I suppose my 100AC is a faulty enclosure and needs replacement.
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ibond

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