The main fat in cacao butter is saturated fat, so it should keep well at room temperature. I personally like to keep mine in the basement. If you can keep it in glass, this would be ideal. This way the fat won't interact with the plastic. My feeling is that plastic bags are not ideal. If you keep it in plastic, use something like a Rubbermaid container. Also, glass doesn't breathe like plastic. Keeping it in the fridge will turn it rock hard. I mean, I don't believe it will do any harm, but you'll just have to wait a little while after removing it from the fridge before using it. If your place gets really hot, like 90 degrees or more, this is the one time keeping it in the fridge would likely be better, esp. if the butter is being stored in plastic. You don't want the melted fat interacting with the plastic.
Subject: [rawfood-213] Storing Cacao Butter
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To: [address removed]
Date: Mon, 16 Jul 2012 12:32:10 -0400