I feel obligated to make a public service announcement after an incredibly close call today. I had my backpack stolen, and (luckily) was able to recover it hours later. Inside, was my computer. More importantly, inside was my data, and it was not backed up.
I have been intending to set up my backup system for a long time now, but hadn't yet found the time to do so. Somehow, I managed to convince myself that nothing bad would happen in the mean time; this was a wake-up call. Don't be like me. Start making backups. I'm doing it right now. I'm enjoying borg backup (https://github.com/borgbackup/borg).