Hope someone can give me a good answer to this. It is two part. The first part involves Time Machine and Super Duper. I am a long-time user of SD but it has stopped working properly and won't backup my computer at the moment. (Waiting for response from SD). So I did a backup to an external hd using Time Machine. No problem there so far. I am going to buy an AirBook for traveling and would like to transfer SOME of my files and programs to it. Can I do this with Time Machine? As I understand from this forum (I searched before posting this!) you can't boot from Time Machine like you can with SuperDuper. Second confusion: As I backup to an external hd and Time Machine seems to want to backup constantly, do I have to keep the external hd always connected or will I be asked to connect it when TM wants to backup? Thanks for any clarification on this.