Heaps of important shit is stored in my emails. Not just information, but also communication with dead people that I really want to keep. That means backing it up is important. I use Apple Mail, which downloads all my messages off Gmail, Outlook, Fastmail and iCloud (I have too many email addresses) via IMAP and stores them on my Mac, which I can then back up like any other file. But if you use Gmail and don't use a mail client on your computer, Got Your Back could be useful. It is a "command line tool for backing up your Gmail messages to your local computer. It uses Gmail's API over HTTPS". Do a big dump of all your emails on the first run, then set up a Linux cron task to run every day and it will download all your new messages from the lat 24 hours.
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