Backup, backup, backup. Then verify your backups. Its what separates the noobs from the seasoned professionals. Seriously. My Time Capsulehas served me well with two MacBooks in my household. Backups just happen automatically, and on the one occasion where I had to do a restore…it worked flawlessly. Even the desktop icons were in the same spot! [tangent: this isn’t very impressive from a programming point-of-view but the desktop is the first thing users see, so well done Apple.