Quote:
Originally Posted by Ezra
I want to backup my Calibre library
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I have kept my Calibre library in a folder that is synced to OneDrive
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Is it a backup solution you want, or a sync? They are very different things, especially when it comes to the kind of database that Calibre uses. Backing up this kind of database to a cloud service or networked drive is fine (bearing in mind the comments about google drive further down this thread). Syncing is not. If you sync your library, you will, sooner or later, have problems.
For a backup, I'm not seeing what "compatibility with gmail" benefit there is, so you might think about considering other cloud services for your backup.