Our great sponsors
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Borg Backup. Its deduplication is amazing, mail folders are mostly unchanged in the day to day activity (new mails are added and read, but old mails remain unchanged, so it will work as incremental). And you can mount the backup of the day you want (at least for the time you wanted to store them) and recover individual files if you want. And, over that backups are compressed (with text files that works pretty well) and encrypted.
To add to this, Borg backup can be a little daunting to configure. There is a wrapper script called Borgmatic that distills it down to a single yaml config file. There are also some cloud hosts like BorgBase and rsync.net with native Borg support.