After a few messages about files that didn’t seem to be corrupt, I decided to check the source and target volumes using Disk Utility. Sure enough, that threw up some errors on this brand-new, used once target volume SSD.
So I reformatted the SSD, and I’m trying the backup again.
I used this command to dump the most recent error messages from Time Machine into a log file (tm.log) I can read in a text editor.
printf '\e[3J' && log show --predicate 'subsystem == "com.apple.TimeMachine"' --info --last 6h | grep -F 'eMac' | grep -Fv 'etat' | awk -F']' '{print substr($0,1,19), $NF}' >tm.log
I found the error message in the log:
Failure to copy ‘/Volumes/com.apple.TimeMachine.localsnapshots/Backups.backupdb/MacBook Pro/2025-03-14-155644/1TB SSD – Gegevens/private/var/root/Library/Logs/Bluetooth/bluetoothd-hci-2025-03-13_19-23-02.pklg’ to ‘/Volumes/Crucial 2TB/2025-03-14-155644.inprogress/1TB SSD – Gegevens/private/var/root/Library/Logs/Bluetooth’, error: -36, srcErr: NO
yep, a -36 error: a read or write failure.
So my initial assumption that the error was about reading a file was incorrect.
