Your infrequent reminder to make backups, and backups of your backups.

Bad: Can't access anything my external drive (called WD-DATA, because it's a WD drive and contains DATA). Apparently APFS fell over itself.

Good: I have Carbon Copy Cloner set up to mirror everything on this drive to another, identical disk so data loss is negligible.

Better: Everything also goes into the cloud with Backblaze, so the few things that CCC didn't catch since the last copy can just be downloaded from there.