I personally don't limit myself to one format. I store what I buy using clibre and it's native file system store. I also store the versions that I convert that into. The files are so small having two copies of the ebook doesn't bother me. I currently got a 500GB external drive for TimeMachine which is Macs auto back up tool. And, I plan to get Jundle disk to back up the TimeMachine "latest" folder to Amazon S3... I feel pretty confident having the ebooks in 3 places is redundent enough to prevent me from any loss.
Of course, the ebooks I bought are also recoverable from the eBooks stores I bought from if needed. So, make that 4 locations where all my ebooks are stored.
BOb
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