I use the free tool MS SyncToy to do simple backups. It's even scheduled on the Wife/kids PC to run nightly. I upgraded to SyncToy 2.0 an noticed on the install that it now includes the MS Sync Framework. I suppose if you've got "sync" in your name, it's hard to get away from dog-fooding that one. You can checkout the video webcast of one of the providers, the file sync provider, by Ashish Shah.