I plan to do a clean install of Mavericks on my wife's 2009 iMac 24" now running Snow Leopard. Regarding backup of her current files and settings, what is the best way to do this without encountering problems with her already-synced iPhone and iPad? I would think that it is straightforward to back up documents and picture library. Then export contacts and calendar info to saved files. Then install apps. What about mail (messages)? Should I export all of the mailboxes, then import after the OSX install? Or can I restore just the messages from a Time Machine backup? How much of this can be done through iCloud? My wife is having issues with occasional spinning beach balls, so I hope that a clean install will resolve this. I've been told that a simple restore from a TM backup might not clear up the issues. Is this correct? Any advice?