You need to back up your files. If you've ever lost files due a computer or network issue (haven't we all?!), then you need to back them up. dropbox.com provides free cloud storage and backup. It automatically syncs and backs up all your stuff, then you can access your stuff anywhere.
Dropbox is a very strong cloud computing app. The entire WikiNotes site is backed up there.
You're given 2GB free normally, but you get a .5GB bonus by signing up with this referral link:
Dropbox.com (opens in a new window)