Which external hard drive should I buy for data back up?  Thanks

emac g4   Mac OS X (10.3.9)  
emac g4   Mac OS X (10.3.9)  

Hello Seventree and welcome to discussions,
If I can assume that the title of your post is your entire question....
Make sure its Firewire - That way, you can boot up the eMac in the, unlikely, event of an internal drive failure / problem. You cannot boot PPC Macs from a USB drive.
Get the biggest you can afford. The external may well outlive the eMac! Many machines now " ship " with 500 Gig drives. That amount is only likely to increase.
Maxtor is one brand that seems to be well regarded among many here. I am sure there will be other suggestions for you.
Regards
Ian

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