Export/Import OPML

I got a lot of Podcast channels inside my app and so I would like to see a “Backup/Import OPML”-Button, which would help me to get all my channels in a opml-list, for a backup and I would be able to share them with others.

2022 clean-up: obsolete (Plex have announced that podcasts will be discontinued)
OPML export described in linked article for migration purposes