This is a small, unrefined app that can visualize Aidoku (and to an extent Tachiyomi) backups online.
Sadly there is no Tachiyomi to Paperback converter that uses tachiyomi's new .tachibk/.proto.gz extension as well as Paperback's new .pas4 archive format currently and I don't have time to build a proper one at the moment.
A workaround (albeit manual) is to use bdashore3's Tachiyomi to Aidoku tool to convert Tachiyomi to a different format, and then pass that into this tool which can assist in visualizing as well as marking them off while manually migrating to Paperback.
There are 'Default' and 'Unknown' are categories for manga that have no set category or are broken, respectively.