Re:If you're willing to spend some $ (Score 1)

As a former employee of Double-Take, its great for enterprise class data replication. Double-Take works on Windows 200x servers (Latest version requires 2003 and up). Double-Take also has special licensing for Windows XP and recently for Linux servers Red Hat and Centos. You could use Double-Take to replicate (backup) to a USB drive, however thats a bit of overheard for simple local backups. At this time there is no Vista or Mac OS X version of Double-Take. In my opinion Double-Take is great for enterprise level, and well worth it's price. However I don't think it would be so great for backing ip your home directories on your laptops. There are cheaper alternatives for a "single user". Hope this helps.