What are other folks using for their backup needs for their MBA? Up to now I've been doing a weekly image backup via SuperDuper augmented by an online daily incremental backup using Carbonate. I like image backups because in the event of an HD failure I can boot from my image and try a repair or replacement and recovery knowing I have an absolutely complete image of everything. But not wanting to loose up to a week or more of work in the event of a failure I want a daily backup too. I've used Mozy in the past but it had reliability issues and did not seem to cope well with intermittent connections. Carbonite has been great but it uses quite a bit of CPU on a fairly frequent basis so keeps the MBA hot with fans blasting so I find it unacceptable on the Air. I've tried iDrive and is seems low overhead but again does not seem to deal well with intermittent connections. I fly a lot and am always going from location to location and network to network. Any suggestions on low overhead backup services that deal well with intermittent connections?