I made a script based on plemmy and LemmyHttp API to be able to backup the list of registered communities and user profile (for now, that's just the biography). It output in human-readable format on console and have an option to output in a json file. The next step will be to provide also a script to restore such json backup to another lemmy instance or user.

I decided to do this small development following the sudden disappearance of vlemmy.net instance which resulted in the lost of all my subscribed communities.