To back up the whole system what size drive would I need to purchase.
You will need a drive at least as large and your internal HDD. If you are buying an external drive, I suggest you get one a minimum of 250 GB; 500 GB would be even better. Don't worry about the extra space, it's not expensive and could come in handy.
Can you use any external hard drive?
I think an external Hard Disk Drive will be your best bet.
Will I be able to boot from this external hard drive?
Yes, if two conditions are met:
1. Your external HDD must be a firewire HDD, as PowerPC Macs cannot boot from USB devices.
2. You create a bootable clone using a utility like
SuperDuper or
Carbon Copy Cloner
I haven't seen one using firewire, just usb drives.
Again, you cannot boot your iBook G4 from a USB device. If you get a firewire HDD, be sure you get one with the more reliable Oxford chipset. Here is a line of
very good external firewire HDD at good prices.
Would I need to use this CCC to copy my computer onto the new drive.
Either of the utilities I linked earlier will do a great job. They are the best.
Won't dragging work?
Dragging will work for data files, and for some other files. However, you cannot copy OS X by dragging. In addition, CCC and SD will make the cloned volume bootable, which you cannot do by dragging. Besides, these utilities make the job a lot less onerous. You just get them started and they do the rest. You can then continue to use the utilities to make cumulative backups and keep your backup current. If you need an explanation of the differences and advantages of both utilities, please ask, as well as if you have any other questions.
😉 cornelius