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Best/safest practice is to keep a CURRENT backup of all books in your calibre library. However, if you don't have a current backup and calibre crashes, Marvin contains a built-in feature to create a current backup of all its books.
The feature is designed to backup Marvin, but part of the backup is a single "documents" folder that contains ALL the books you have in Marvin.
The simplest way to use Marvin's backup feature is to create the backup directly on the iPad and then use iTunes to copy it to your Macbook. Space required is about 1:1. For example, if you have 500 MB of books in Marvin, you will temporarily need another 500 MB of space on your iPad to create the backup. After the backup is copied to your Macbook, you can delete it from your iPad to regain all of the space.
If you decide to use Marvin to reload books into calibre, post here if you need additional details.
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