Jellyfin 12.1 is a bugfix release, and several fixes land on the 12.0 upgrade
Jellyfin 12.1 is 47 fixes six days after 12.0, and several of them touch the migration and the pre-migration backup.
Jellyfin
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Jellyfin 12.0: modern on the surface, rebuilt underneath
Jellyfin 12.0 makes its Modern layout the default and rebuilds how playlists and collections are stored — and it rewrites your database on first boot, so the backup is the only way back.