Thanks to Gerald Gibson Jr.'s great article I now have a free way to do daily backups of my laptop. Windows natively supports the zip format (as "compressed folders"). The article is a C# program that generates ZIP files using the Shell API.
(Be sure to get the latest version from Gerald's web site)
My app zips several important directories into zip files in c:\zip. Then, using a free account at box.net I upload the zip files daily. The free account has a limit of 1 GB and each file must be less than 10 MB. But for 5$ a month you get much larger maximums.
Not the finest solution; but it'll do for now. KISS.
Update: A Mozilla plug-in called GSpace turns your GMail account into a FTP site. Each file you upload becomes an e-mail. GMail now has 2.5 GB of storage.