Goodgulf:
Local copies of all your work is a must have for anyone who posts on the net.
Yes! What Goodgulf said. Your stories should be important to you, so don't lose them. I keen my own stories in a password protected file.
But because anything in a computer can be lost, you should also have them somewhere in the "cloud" (Google Docs, Lockbox etc., etc.). In my case, I simply post them to my blog, which has outlived more computers than I care to remember.