Ever since I've been visiting this site there have been various posts about backup and syncing tools. I've just downloaded a free piece of software called FullSync and so far I've been very impressed. It allows you to backup to an alternative folder or hard drive and can even be used across a network. I have it set to backup work files to my second hard drive and then from there to my tablet. All I have to do now is make it a two way process between the tablet and desktop and I think I'm sorted ( I hope so at least).
Here is a link to the home page for anyone interested http://fullsync.sourceforge.net/
Hope this is helpful to someone