Jan Švec and I wrote Gmail Backup back in 2008 — a one-click tool that pulled your Gmail down over IMAP into a local folder, with incremental backups so you only fetched what was new. It ran on Windows and Linux, the code went out under GPL v3, and for a few years it was the answer people gave when someone asked how to get their mail off Google's servers.
It is old software and the world has moved on, but the site is still up: www.gmail-backup.com, with the downloads, the documentation, the FAQ and the forum threads intact. I recently moved the whole thing to static hosting and put it back on HTTPS, which is the only reason it still loads at all.
Worth remembering the premise, which has not aged: your mail is only yours if you have a copy of it.
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