I want to reinstall the OS but retain my data. The obvious answer to that is, of course, do a Time Machine backup and restore from it, but that restores all sorts of system files too. The idea is I want a clean system, but to retain my home folder. From what I've read, the best way to do this is set up Time Machine to exclude /usr, /sbin, /private and /bin then restore from that backup, thus restoring personal data but excluding the system. All I want to ask is, will that work? Or will it cause complications when restoring from the backup, since OS X expects to be able to get those files from it rather than having to get them from the install disk? If you have any other suggestions on how to do this, they are more than welcome. Bare in mind, though, I have notes in Mail (which are backed up from my iPhone and are important) and iTunes backups which can't be put back by a simple drag and drop as far as I'm aware. I'd also like to retain my Keychain and other such not so obvious but important user data. Thanks!