Upgrading from 3GS to 4S tomorrow.  iOS5 a necessity on my 3GS first?

I'm upgrading to a 4S tomorrow. My 3GS is currently backed up, but not with iO S5.  Can I restore from backup with the 4S successfully without making a backup of my 3GS with iO S 5?

All previous versions of iOS you do not have to update your old iPhone for the Back Ups to work perfectly. Many users will be going from Original and 3G iPhones which cannot go to iOS5. You will have to update iTunes however.

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