Welcome to Flyertalk
A bit more information.
What type of data, personal or business?
How much data, a few Gigs or hundreds?
How recent, is it a backup you want once a month or once a week, or live so that every time you change a file it gets copied over?
Is backup what you are looking for or just having files accessible while you are on the road? There are products for either.
What type of connection are you talking about when on the road, the speed of the connection will greatly impact the performance.
Personally I use dropbox, I was a huge fan of the microsoft solution but they no longer support XP so I moved over to dropbox. It took a while for the first upload of a couple gigs of data, but after that it's been flawless.
I used it both on machines that would auto sync, and at work where I would manually pull and place files to the "cloud"