The only file you need to worry about is wallet.dat (location dependent on operating system). If you copy that one file (the wallet.dat) to another computer (or to a secure backup), you will have access to your XBY and address book. Place the copied wallet.dat file in the new computer (in the correct file location)
This only applies to your money and address book. If you only copy the wallet.dat, you will need to re-download the entire block chain on the other computer (so you may want to copy the other files too, but it is not necessary).
I have done this with XBY wallet.dat files and it has worked perfectly! There are other ways, such as setting up multiple wallets and having the client redirect to each one. If you have anymore questions, please ask!
Last edited: Nov 17, 2017