Hi,
We are using regular WordPress tables.
Users are regular WP users (wp_users table).
Our private posts are regular WP posts (wp_posts table, the ones with post_type starting with « cuar_ »)
And the rest is just options and meta (user_meta and post_meta).
As a consequence, any decent migration tool should be fine to do the job. For instance WP Migrate DB.
Regards,
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