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I've found that the dos "backup" is much slower than the export of my small library (750 books, but double that as epub & aw3).
The copying of the Calibre library also means all the library directories are duplicated which takes time & linkages to various places on the hdd. However, an incremental copy can be done with "robocopy" that is in win7-win10; someone did a gui interface so that one does not have to enter the command line options.
The export process seem to compress/zip the library before writing onto the destination so that the process of recreating directories does not need to be done. I don't know of any way to extract a book from the exported file but can be easily done if the files/directories were just "copied".
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