The title itself shouldn’t be a surprise to anyone, but I just read at golem, that you can get a notebook with a 160GB harddisk for 999. That’s a LOT of data. In fact it’s so much data that you get into a lot of problems if you loose it.
If you have such a lot of files, you should consider making regular backups or synchronize it with you main computer. The latter has the positive side-effect that you have the same data available on both the main PC and the notebook. Very useful. Check out Easy2Sync for Files and Easy2Sync for Outlook.