In the most recent video journal Michael details his backup routines in various scenarios.
In the field with a laptop segment I would offer a suggestion. The ingestion routine he uses is to import into Lightroom and simultaneously backup to a portable drive. He then makes another copy in a device such as a Hyperdrive.
In order to reduce the impact of a hard drive failure in the laptop (which also renders the portable drive useless) I partition one of my portable drives into two partitions. I then use a program called Super Duper to create a clone of my MacBook Pro laptop drive. I still have plenty of gigs of storage in the second partition of the portable drive for images. This way, should my laptop drive fail, I can boot from the external and continue to process.
Before I leave for a trip I update the clone on my OWC portable drive.
This adds one more layer of protection against a drive failure in the backup routine.
Mike