I've been searching for backing up user code snippet for Xcode, and i got this below which is only for system snippets!
For Xcode's self contained app. This is the exact file path of the default snippets: "/Applications/Xcode4.3.3.app/Contents/PlugIns/IDECodeSnippetLibrary.ideplugin/Contents/Resources/SystemCodeSnippets.codesnippets
Where is the user code snippet for Xcode 4.6?
Your user code snippets can be found in
~/Library/Developer/Xcode/UserData/CodeSnippets/
Where the ~/Library is the current users home directory.