All my books get added to Calibre, which has DRM removal plugins installed. My Calibre library gets copied to my server with rsync every day (I wrote a PHP script to let me access my library via a web browser), and it's in Dropbox.
About once a week, I use rdiff-backup to backup my home directory (including my e-books) to an external hard drive. Occasionally, I put an encrypted copy of my backup onto my work computer or my mum's computer.
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