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A calibre backup, made using export library, is almost the same size as the library it is based on, because all the books are in compressed formats to start with.
Copying the library to Dropbox makes more sense, you can mirror it i.e. one way sync it incrementally, access it directly with apps such as moon reader... All at no risk to the source library.
If you disagree on the size thing, then run some tests, and post your results.
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