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Originally Posted by inkyichi
If you copy your entire Calibre folder to a thumb drive, will it save all your meta data and series information? If so, how do you restore it all from a usb drive?
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There seem to be two main backup strategies around: The first one would be using Calibre's save to disk- feature to save all books in all available formats to disk. If done correctly, you can then reimport the books into an empty library using the one book per subdir, files are different formats book adding option.
The other strategy is just grabbing the Calibre library folder and backing that up somewhere, including the metadata.db file that's in the folders' root.
Both strategies preserve what metadata is available at the time you do the backup.
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If your hard drive fails and your last back up was 4 months ago, can you use your e-book reader to download all your current books to the library and then use a old meta data file to restore whatever information it has? Will it corrupt your current Calibre Library?
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Depends on how you do it. Once you've restored an older library from a backup, you could use the copy to library- option in a books' context menu (while in the device view) to get the book copied to the library. You shouldn't, however, try to manually mix two different backups into one. That will most likely mess up your database (not irrecoverably, but still).