I'm using lieer and mujmap to sync my Gmail and Fastmail accounts to a local notmuch mail storage on top of ZFS pool. That ZFS pool is in turn replicated off site.

I use neomutt to access my archive over SSH. And notmuch is very fast at searching all of my emails.

* https://github.com/gauteh/lieer

* https://github.com/elizagamedev/mujmap

* https://notmuchmail.org/