I remove DRM, convert to plain text (with ReST markups), xhtml, and epub (rebuilt from the xhtml using a custom toolchain I've been working on). This entails a fair amount of work with each new book, but I'm happy with the results so far. I can also generate other formats if the need arises.
All of the ReST files are automatically mirrored on my server, my home computer, and at least two additional machines in separate geographical locations. I'll likely be adding an additional mirror at some point.
The xhtml and epub are generated (using a modified docutils and my custom epub building tools) from the ReST files, and generally can be rebuilt in a fairly short amount of time. (~50 books every 3 minutes on my server), so they get mirrored, but not as extensively.
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