After creating an account, almost a decade ago and depositing $5 of credit, I've finally started making use of Tarsnap - "Online backups for the truly paranoid".
Most of my stuff is either ephemeral, or simple enough to rebuild, but a few new things recently made me realise they would be a right pain in the backside to have to recreate so it's time I started getting things backed up properly.
Setup one machine this morning and got my first backup in place. I'll wait until tomorrow to make sure the overnight cron job also works and of course make sure I can recover the backups before I start celebrating.
Now, where did I put that @mwl book?
https://www.tarsnap.com/