Justin Tadlock 4 years ago These are not CPTs. They are post formats, which are built into WordPress core. It’s nothing more than a taxonomy such as categories and tags. Some themes support post formats and some don’t, which is why you only see the meta box with some themes. None of your data will be lost when switching to a theme that doesn’t support them. Post formats are not about data though. They’re about design. The feature is a way to let themes know that you want to give a post a specific design. For example, one theme’s design of the “video” post format could be completely different from another theme’s design. There’s no data lock-in with post formats. With that said, be cautious of themes that have special fields for different post formats though. They do lock you in. None of my themes do this and it’s not allowed on WordPress.org either (though a few have slipped through the review process). You’re more likely to find this issue with commercially-sold themes.