Quote:
Originally Posted by gmw
I notice that the library "Export/import all your calibre data" saves everything to a single folder as one or more files of what seems to be a proprietary format (at least 7zip fails to make proper sense of it) and so you would have to use Calibre to recover any data from that folder. (Which makes testing the backup a bit more difficult: presumably create a new library and then import into it using Calibre.)
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gmw - Export/Import was implemented to facilitate one-off transfer of calibre libraries and configuration data (plugins, preferences, customisations etc) between computers, including from one platform (operating/file system) to another platform - e.g. Windows/NTFS to Linux/Ext4. Anticipated usage was when someone got a new computer, but not as a backup medium.
And with Save to Disk, the Preference settings control what is saved, e.g. there are check boxes for the cover and opf files etc.
BR