I could use some help. Should I upgrade to Liberty 3? I don't know what I am doing

You won't lose anything from your sdcard when you sbf and root your old droidx. Your pics and videos will remain, nothing gets touched on the card so don't worry. You also asked about switching out the sdcard from your phone to your dads phone and yes you can do that easily if you wanted to but it sounds like your gonna get your old x going instead. You probably know how to switch cards out if you ever decided to go that route but just in case your not sure here's how http://m-support.verizonwireless.com/clc/devices/knowledge_base.html?id=33725

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