Bear with me for a few seconds more. I’m the first person to see shortcomings in the MacBook Air, and I was disappointed with Apple’s MacWorld announcements in general, BUT their backup concept is beautiful, and finally coming together. Time Machine was included in Mac OS X Leopard, and initially looked like a bit of a gimmick. The 3D representation for time going backwards is of course well known and established in many academic fields. Nothing new there. However, further research reveals (and their marketing material won’t satisfy here) that backup is incremental, that is, it focuses on the files that have actually changed. And now it seems you can use your laptop anywhere in your home and send files to the imo very reasonably priced $299 or $499 Time Capsule (essentially a network drive). The maximum data rate based on the 802.11n specification used, would seem to be 31MB/s, with a range of about 70m through walls (using SI units, m=metres). It remains to be seen exactly how seamlessly Time Capsule integrates with Time Machine and multiple user accounts on multiple computers. It also remains to be seen whether connecting a 1TB drive externally is seamless and, once connected, invisible to the Time Machine user. I have a suspicion that although using hubs, you can in principle connect up to 128 (iirc) devices through a single USB port, Time Capsule may not support this at the data rate one would hope for. On the other hand, I would be quite upset having to buy multiple Time Capsules and not know which one holds the data I want. Certainly, a recent software update re-enabled Time Machine backups to USB drives connected to an Airport Extreme or Time Capsule. It’s not clear what market Apple envisages for the device, because 1TB is not enough for people who seriously work with video, so the eligibility of Time Capsule for that market will crucially depend on whether several devices can be connected by USB, and whether the device keeps performing well under such conditions.