Jmap-backup: Back up Fastmail mailboxes to standard EML format files

This is a Python program to back up messages from a Fastmail mailbox via JMAP API to a local or network-attached directory.

Standing on the shoulders of the great work of Nathan Grigg[0], I've updated and extended it with a few new features. The README contains instructions for running it locally, or via Docker if you prefer.

Hope it's useful to someone, let me know if you encounter issues.

[0]: https://nathangrigg.com/2021/08/fastmail-backup/

Thank you for this!

I've been looking for a backup solution for Fastmail for a while, thank you!