Backup early, backup often, and firewall your backup from the internet. This from io9.com:
In this case, the mass e-book removals were motivated by copyright . A company called MobileReference, who did not own the copyrights to the books 1984 and Animal Farm, uploaded both books to the Kindle store and started selling them. When the rights owner heard about this, they contacted Amazon and asked that the e-books be removed. And Amazon decided to erase them not just from the store, but from all the Kindles where they’d been downloaded.
Regardless of whether you believe Amazon’s promise to leave your Kindle alone, the company has tipped its hand and shown us the dark side of a culture where books are only available in electronic form. If the WhisperNet service from Kindle allows the company to delete books silently from your device, what other information might they have access to? Can the company monitor what you’re reading and when – and then hand that over to law enforcement? Can it replace a book file with a different file whose content is changed?
Read the full article here
Source:
http://tallbloke.wordpress.com/2013/04/09/sinister-irony-amazon-silently-delete-orwells-1984-from-customers-kindle-e-readers/