With apologies to patio11, Backup backup backup BACKUP backup BACKUP. There are many, many bad things that can happen to your data, which can be mitigated with

With apologies to patio11, Backup backup backup BACKUP backup BACKUP. There are many, many bad things that can happen to your data, which can be mitigated with proper backups. Also test your backups. Important even if you're not using FDE, but by design FDE makes any data corruption significantly worse. Not an Apple specific problem, either. LUKS is actually specifically designed so that the master key is wrapped in a large all-or-nothing transform (anit-forensics) to make it exponentially harder to recover from a damaged header.