I do the same thing. Won't save you when there is no internet, though.

Then again, I lost count of how many times Dropbox saved my butt, so that should be a no-brainer regardless of your storage technology.

A very expensive way, though? My notebooks HD is 250gb, almost filled.

Sorry to see this and respond late, but yeah, mine is pretty big too. Most of that doesn't change hour-to-hour in my use case luckily, so incremental backup to disk is good enough for the bulk. If you work mostly with code or other text, you can probably find a few folders of frequent business that fit on a small Dropbox plan and just sync those.