I'm already around Europe with my laptop and my concern are the backup is my laptop was lost or steal.
Each time I'm back at home in Luton, I perform a complete backup of my pc on the server using my wifi network.
The standard Vista user interface doesn't allow you to perform backup to a shared network drive, instead you need to use the wbadmin.exe (http://technet.microsoft.com/en-us/library/cc742083.aspx) command line application.
Use the following script:
wbadmin start backup -backupTarget:\\MyServer\MyShare -allCritical -user:MyDomain\MyNetworkUser -password:MyPersonalPassword
If you have the UAC on, on you must execute the script as Administrator.
For more information take a look to: http://www.techinvasion.net/2007/11/12/vista-complete-pc-backup-to-network-share/