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What exactly does time machine back up? Is my whole iTunes library backed-up, or do I still need to keep a backup of media files on a external HD? Thanks everyone!!
Time Machine will back up everything unless you specify in options that certain files or folders are to be excluded. Keep in mind that the first run of Time Machine will take considerable time to complete. Afterward, it will only back up what has changed. Also... Time Machine backups are not bootable.