I placed my order this morning for my new iMac...now I have a question on saving files and photos from old system. My old system is running Snow Leopard with an external Time Machine backup. My question is, can I plug the Time machine external drive into the new machine to transfer backed-up files and photos? I know there is an option for a Time Machine backup(or there was on my old system at start up), which displays at initial start up. If this can be done, are there any compatibility issues between Snow Leopard and Mavericks files? Do I just select install from Time Machine backup? If it is not possible to do this or a better method for saving files and photos ,I would appreciate your assistance..thank you in advance.