@Zeros - Calibre doesn't backup your library, that's up to you, same as it is for your other data, such as photos, documents, music etc etc.
It does backup its database but it does that within the library.
Do you have your books on a device, like an ipad or kindle, if so then you should be able reconstruct the library at least in part from your device(s).
Let us know if you want to do that and someone who's done it should be able to give you some guidance.
The bottom line is if you haven't been taking backups then its probably safe to assume that there aren't any, but hopefully you'll have most of your books on your devices.
BR
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