A Live-Mirroring System for Remotely Connected Machines
Related link: http://www.bsdcan.org/2005/activity.php?id=54
Dan Langille tipped me off that BSDCan 2005 will host the premier of a new open source tool to perform opportunistic live mirroring of remote systems over the Internet. Anywhere you go, if you have an Internet connection, the tool will mirror changes to your filesystem to your backup server. It's NetBSD only for now, but it sounds useful enough that there'll soon be ports to other operating systems.