Your automatic backups may actually be corrupted by random bit flips. Happens quite a lot with ZFS NAS systems where the admin forgot to set up a scrub job and

Your automatic backups may actually be corrupted by random bit flips. Happens quite a lot with ZFS NAS systems where the admin forgot to set up a scrub job and still uses incremental backups. Any read or write could fail for a multitude of reasons. The chance of an entire file being lost is rather small, but it's still an edge case that can happen in the real world if the FS flips to read only at just the wrong time. Hell, on platforms like macOS, you can't even assume fsync returning success will actually write floating data to storage!