> ... server-based solution that connects to my IMAP-based email provider, and saves backup snapshots to cloud-based storage (e.g. Backblaze, S3, etc.) using de

> ... server-based solution that connects to my IMAP-based email provider, and saves backup snapshots to cloud-based storage (e.g. Backblaze, S3, etc.) using de-duplication to save space. You could rather quickly and easily write a shell script to: - use offlineimap [0] or imapsync [1] to perform a local sync of your mailbox to local mbox files or maildir directories, - (optionally) use tar or similar to create a single file out of your entire mailbox, and - use tarsnap [1] to back it up (to AWS) or s3cmd [2] or similar to back it up to wherever you want it. I used to do exactly that with an additional step to encrypt the tarball (with GPG) before uploading it. It worked out quite well. --- [0]: http://www.offlineimap.org http://www.offlineimap.org [1]: https://imapsync.lamiral.info https://imapsync.lamiral.info [2]: https://www.tarsnap.com https://www.tarsnap.com [3]: https://s3tools.org/s3cmd https://s3tools.org/s3cmd