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If you have Marvin on a current device you can connect it to a computer that is running iMazing and save the ipa file to your computer. Then you can use iMAzing to install that ipa file on any other device.
If you are talking about the backup of your books from within Marvin, then you won't be able to restore books without a backup file, but you will be able to re-download any files from your normal sources like OPDS, dropbox, or calibre.
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