Taking backups is always a good idea. It’s just proved useful for me, not because I’ve had a catastrophic failure and needed everything back, but because I accidentally saved one document over another and needed to get the original back. I started playing with iBackup some time back and had taken an archive of my My Documents folder and that’s what saved me! I don’t tend to use online storage much, usually prefering to back things up to USB disk, but iBackup has an easy drag-n-drop interface that is really easy to use. And as long as you have an Internet connection, you can always get to your files.
How do you backup you files ?

Some time ago my laptop broke and I just about had a nervous breakdown. Luckily I had another laptop which was almost identical so I got a computer guy to swap the hard disk over.
Loosing all your work is no laughing matter.