Google now lets you schedule up to 6 automated Takeouts a year, so you get an email every 2 months with links to download all your stuff. If you do this every

Google now lets you schedule up to 6 automated Takeouts a year, so you get an email every 2 months with links to download all your stuff. If you do this every year (I do it on Jan 1st as part of some other yearly reminders) then at most you lose 2 months of data (certainly not downplaying the gravity of that but it's better than everything).