How do you go about that? The documentation says:
Q. Can imapsync be used to maintain and restore a local offline copy of a mailbox, eg for backup purposes, using Mbox or Maildir format, so that if the server fails, then the mailbox could be reinstated?
R1. No. Imapsync plays with IMAP servers only.
Do you have anything set up with evolution to handle things automatically?
Re offlineimap, just looked into isync/mbsync suggested here by others, it seems better from the description, I'm probably going to try it when I have some time: https://people.kernel.org/mcgrof/replacing-offlineimap-with-...
It's the most performant solution that's also mature. I've used it for years to retrieve all of my email accounts (of which gmail is one) to a folder that I also backup.
I don't think I want all my email on my local machine, but I do think I want it all in the backups.
I couldn't see anything digging in.
Do you use your email client to periodically backup? (I would like it automated).
Do you use thunderbird or something else if so?
eM Client might also be worth a look: https://www.emclient.com