When I came in Monday morning my main production SQL server was down due to a hardware error. After talking to tech support it was decided the box required a new motherboard. We're a small non-profit so we don't have fail-over, replication or any such thing. Fortunately I have good backups! I had just started building a replacement server so I used the new server, installed SQL, restored databases from backup and was up in two hours. Everybody was happy after that.

One thing I've learned as a DBA: backup databases, practice restoring databases. It may be boring but can save your job and your companies data!