@Kaylee - if you lose your entire library then it may be possible to rebuild it from the EPUBs. But it will be a lot of work and you may not be able to recover the database in its entirety.
IMO - The marginal extra costs in disk space and time to backup the entire library so as to mitigate the risks of not being able to achieve a complete and full recovery of your library would be a worthwhile investment.
BR
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