Remote Laptop Backup

Hello I am searching for a solution for our remote laptops users. We have a small network with a windows 2003 server in place, but a lot of our users work outside of the office, I am looking a for solution that can either need no user actions or very few actions to backup data on the laptop. We was thinking of setting up VPN for each laptop and map a folder on the server to there system and request the user to copy and paste there my documents into the network folder once a week, wanted to see if there was a better option?