The back up "sync" to iTunes should be sufficient. The backup file has worked for me on several occasions. Basically, with my iPhone, I have had to rebuild it from a new phone every time that I updated to a new iOS. Hopefully, with the new iOS 5.0, I won't have to do that anymore. Unfortunately, there was that one time that I had to use the two-way-sync from GB. I am just saying that you will be able to get your GB data back with the restore most-times and if you need it you can go the two-way-sync route.
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Regards;
Danny 
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