Will I Lose my Content if I Switch to Jupiter X
No, you won’t lose your content after switching to Jupiter X theme.
Despite of integrating the Elementor editor in Jupiter X, you still will be able to use WPBakery Page Builder if your site was created with this plugin.
If you’d like to move your content to Elementor, you’ll have to create new pages with Elementor editor. For more infotmation, you may visit this article.