A very good article: The Internet of Things and the cloud:
"The current storage infrastructure and file systems that backup and form the backbone of the cloud are archaic, dating back 20 years. These systems may be familiar and comfortable for infrastructure providers. But over time, block-storage architectures that cannot provide instant snapshots of machine images (copy-on-write) will continue to be prone to all sorts of failures. Those failures will grow more pronounced in the M2M world when a five-second failure could result in the loss of many millions of dollars worth of time-specific information."