Backing up a Mac and a PC on one Ext HD?

in Mac Software
Season's greetings.

I Would like to backup my iMac and PC to a common external HD in roughly the same way this guy says 

My thinking is to format one partition to the PC in ex-fat and then format the rest of the HD to Super Duper and Time machine as per the way I do it now.

Any problems with doing this?
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