Re: not yours
Also DO NOT download direct to DRM enabled devices. DRM actually is contrary to the principle of copyright and doesn't stop commercial pirates.
If getting eBooks, buy from Smashwords (legal and no DRM and all devices), or if Amazon, NEVER direct to Kindle or Kindle App. Select Transfer via USB and download to Mac, Windows or Linux. Make backups. Remove DRM if you are outside USA.
Do not EVER rely on Cloud storage.