I have an iMac running OX 10.5.8 I need a portable external harddrive to back it up before updating the software to Yosemite but I can't find anything that doesn't require you to be running at least OX 10.6.  Is there a suitable hard drive?

I have an iMac running OX 10.5.8
I need a portable external hard drive to back it up before updating the software to Yosemite but I can't find anything that doesn't require you to be running at least OX 10.6.  Is there a suitable hard drive?  I'm not very technical and wouldn't know how to do any formatting so I want it to be very basic so that I can just plug it in.  500GB should be more than adequate.

Correct.  When you purchase devices, they would have stated the OS they needed to work, on the box.  This can be overlooked, but it is very important to check when purchasing. 
You current OS, is so old, that they technology build into the new devices, is not something your OS understands.  It didn't exist when your OS was created, and therefore you need to upgrade the OS to work with the newer technology of these devices.
10.6 software is not downloadable.  You must purchase a DVD disc.  You can order it from the on-line apple store
- http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard.

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