The Amazon cloud services outage that knocked out several popular Websites last week raised questions about the reliability of the cloud, but the general consensus is that it works if you plan for failure. Like any good business plan, a good cloud plan should include provisions for failure, including plans B and C, and plenty of backups.
When I started teaching viola and violin years ago, I brought all the books my students used along with me, just in case the kids forgot theirs. Then the kids became more advanced, and I had to carry more books. I also sent them each home with a practice chart for the week. The studio grew, and I printed out more and more weekly charts.