I'd like to use Thunderbird to regularly download all the mail in my Gmail account via IMAP, so if something happened to Gmail or my internet connection is disrupted, I can still access all my mail.
My question is specifically about Thunderbird. Besides setting up the IMAP account, what else do I need to do in Thunderbird to ensure that all messages and attachments are synchronized locally as often as possible (not just when I "go offline" or manually synchronize).