Having more than one credit card can be a definite advantage. Check out some disadvantages of having one card in this article in Yahoo Finance by Libby Kane:
http://finance.yahoo.com/news/heres-why-having-one-credit-194000850.html
You should always have a backup credit card on general principles (what if my card gets hacked, what if an emergency puts me close to my limit temporarily, etc.) A backup is always a good idea. Something to think about in the future.
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