My Time Machine backup drive got corrupted. The oldest backup on that drive was from 2012, and now it's gone. I've been running and migrating the same macOS install since before my daughter was born. That drive has outlived like three laptops. RIP, Midna. Long live Mercedes (I name my drives after video game characters because I am very cool)
I know what you're thinking but it's not my only backup; I'm not a sociopath.