A couple of weeks ago I set up a new computer for our client. We don't really do this much lately, so had to think about exactly what we'd need to do in order to move all of the data over quickly and efficiently. I burned a backup disc and also dumped all of the files into the client's Dropbox folder, which we had set up previously with this backup of files in mind. This client had mostly documents, so it was not a huge amount of data to move over. This client was also using Google Apps, which meant lightning-quick email setup.
After setting up the new machine, I found the disc I had made was not working - it had been burned and the data was on it, but it was unreadable. I used Dropbox to pull all the files onto the new machine and had one happy customer.
The moral of the story is that it can be great to have cloud-based programs as a backup plan, as it saves spending (or billing) more time to set up clients.