Upgrade SL to Ext HD?

in macOS edited January 2014
I just got my SL disc and I'm hesitant to install to my main internal HD....I have a lot of 3rd party progs that might mess up...My question is..Is it possible/advisable for me to upgrade to my back-up SuperDuper copy that is on the 1st of my 2 LaCie d2 1TB hard Drives that are daisy-chained to my FW800...This Dupe copy is also 1 of 2 patitions on this drive, the other of which is my TM back-up..The second LaCie is simply a data back-up....Is it a good idea to do? Or not..If I can resolve any issues there, then I would then upgrade my internal Thanks!
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